dev-db/postgresql: drop old Perl workaround

The code being removed here can't work with modern Perl:
```
$ perl -e 'use utf8; use re; package utf8; require "utf8_heavy.pl";';
Can't locate utf8_heavy.pl in @INC (@INC entries checked: /etc/perl /usr/local/lib64/perl5/5.38/x86_64-linux /usr/local/lib64/perl5/5.38 /usr/lib64/perl5/vendor_perl/5.38/x86_64-linux /usr/lib64/perl5/vendor_perl/5.38 /usr/lib64/perl5/5.38/x86_64-linux /usr/lib64/perl5/5.38) at -e line 1.
```

The original reporter of the bug it was added for (bug #518522) was Chris Mayo
who can't reproduce the original problem. Given it now actively causes an issue,
let's drop it, and not worry about replacing it with something else right now -
it's unclear anything is needed now.

This still leaves pollution in postgresql.conf - which I leave to the pgsql
maintainers to resolve, but at least we're not adding it for new installs now.

Note that it's likely https://bugs.gentoo.org/518522#c6 was still an issue
and this will be resolved now too.

Bug: https://bugs.gentoo.org/518522
Bug: https://bugs.gentoo.org/792537
Signed-off-by: Sam James <sam@gentoo.org>

dev-db/postgresql/postgresql-12.18.ebuild

@@ -398,13 +398,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-12.19-r1.ebuild

@@ -398,13 +398,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-13.14.ebuild

@@ -406,13 +406,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-13.15-r1.ebuild

@@ -406,13 +406,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-14.11.ebuild

@@ -406,13 +406,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-14.12-r1.ebuild

@@ -406,13 +406,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-15.6.ebuild

@@ -408,13 +408,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-15.7-r1.ebuild

@@ -408,13 +408,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-16.2.ebuild

@@ -409,13 +409,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-16.3-r1.ebuild

@@ -409,13 +409,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"

dev-db/postgresql/postgresql-9999.ebuild

@@ -388,13 +388,6 @@ pkg_config() {
 	# overridden in the initscript
 	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
 
-	cat <<- EOF >> "${PGDATA%/}"/postgresql.conf
-		# This is here because of https://bugs.gentoo.org/show_bug.cgi?id=518522
-		# On the off-chance that you might need to work with UTF-8 encoded
-		# characters in PL/Perl
-		plperl.on_init = 'use utf8; use re; package utf8; require "utf8_heavy.pl";'
-	EOF
-
 	einfo "The autovacuum function, which was in contrib, has been moved to the main"
 	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
 	einfo "by default. You can disable it in the cluster's:"