The following commit:
commit cf4fd28ea4
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Tue Oct 26 19:43:18 2021 -0500
Broke --disable-multi-arch build for x86_64 because x86_64/memcmpeq.S
was not defined outside of multiarch and the alias for __memcmpeq in
x86_64/memcmp.S was removed.
This commit fixes that issue by adding x86_64/memcmpeq.S.
make xcheck passes on x86_64 with and without --disable-multi-arch
