net-mail/mailutils: drop -fno-strict-aliasing

It was added quite a long time ago in commit
228ea23cb7dbb0a469e85d0089802c209118ac35

I don't see any -Wstrict-aliasing warnings with 3.18 or 3.19 and
the testsuite passes. If I had to guess, maybe it was fixed by
upstream commit 4f36463dfe2d17b2932a656fffee9aeb7832abe4.

Closes: https://bugs.gentoo.org/955777
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Eray Aslan <eras@gentoo.org>

net-mail/mailutils/mailutils-3.18.ebuild

@@ -87,7 +87,6 @@ src_prepare() {
 src_configure() {
 	# bug #943873
 	append-cflags -std=gnu17
-	append-flags -fno-strict-aliasing
 
 	if use guile; then
 		export GUILE_SNARF="${GUILESNARF}"

net-mail/mailutils/mailutils-3.19.ebuild

@@ -87,7 +87,6 @@ src_prepare() {
 src_configure() {
 	# bug #943873
 	append-cflags -std=gnu17
-	append-flags -fno-strict-aliasing
 
 	if use guile; then
 		export GUILE_SNARF="${GUILESNARF}"