[glibc] Add a comment for --enable-initfini-array [BZ #27945]

[H.J. Lu <hjl@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cbcd65c8b526555d9b98628338973f91f74002ad

commit cbcd65c8b526555d9b98628338973f91f74002ad
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Nov 8 07:49:11 2021 -0800

    Add a comment for --enable-initfini-array [BZ #27945]
    
    Document that --enable-initfini-array is enabled by default in GCC 12,
    which can be removed when GCC 12 becomes the minimum requirement.

Diff:
---
 scripts/build-many-glibcs.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index e8b9b213ca..6ae2172956 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -1445,7 +1445,9 @@ class Config(object):
         # checking support.  libcilkrts does not support GNU/Hurd (and
         # has been removed in GCC 8, so --disable-libcilkrts can be
         # removed once glibc no longer supports building with older
-        # GCC versions).
+        # GCC versions).  --enable-initfini-array is enabled by default
+        # in GCC 12, which can be removed when GCC 12 becomes the
+        # minimum requirement.
         cfg_opts = list(self.gcc_cfg)
         cfg_opts += ['--enable-initfini-array']
         cfg_opts += ['--disable-libssp', '--disable-libcilkrts']