sys-apps/the_silver_searcher: fix the no-LFS64 patch

According to the documentation glibc still defaults to 32-bit file
offsets on 32-bit arches, therefore tell autoconf to check if it needs
to explicitly set this to 64.

Straight-to-stable revbump on the off chance someone has emerged the
ebuild using the previous version of the patch on a 32-bit system. And
that's enough of messing with this without the usual ~arch revisions.

Signed-off-by: Marek Szuba <marecki@gentoo.org>

sys-apps/the_silver_searcher/files/the_silver_searcher-2.2.0-no_lfs64.patch

@@ -1,6 +1,17 @@
 LFS64 interfaces are now generally considered deprecated, and are no longer
 available in MUSL since version 1.2.4.
 
+--- a/configure.ac
++++ b/configure.ac
+@@ -12,6 +12,8 @@
+ AC_PREREQ([2.59])
+ AC_PROG_GREP
+ 
++AC_SYS_LARGEFILE
++
+ m4_ifdef(
+     [AM_SILENT_RULES],
+     [AM_SILENT_RULES([yes])])
 --- a/src/zfile.c
 +++ b/src/zfile.c
 @@ -4,7 +4,7 @@