Code freeze for glibc-2.20

[Allan McRae]

Community,

The code freeze for the glibc-2.20 release is now in full effect.

There are still a couple of -Wundef warnings to be fixed, and it is
aimed that these will still be committed given they should result in no
effective code changes.  Everything else mentioned in the wiki is either
applied or scheduled for glibc-2.21.

Architecture maintainers, please report your build status on the wiki
page [1].

Cheers,
Allan

[1] https://sourceware.org/glibc/wiki/Release/2.20