Bug#956418: src:glibc: Please provide optimized builds for ARMv8.1

[Florian Weimer <fweimer@redhat.com>]

* Florian Weimer:

> I raised the matter of compiler defaults on the GCC list:
>
>   <https://gcc.gnu.org/pipermail/gcc/2020-April/232261.html>

The link is now: <https://gcc.gnu.org/pipermail/gcc/2020-April/000491.html>