[AArch64] Back out sqrt() addition to libm-test-ulps.
[AArch64] libm-test-ulps regenerated from scratch.
Fix hypot handling of subnormals (bug 16316, bug 16330).
Fix dbl-64 hypot spurious underflows (bug 16314).
Update powerpc-fpu ULPs.
[AArch64] Implement FUTEX_*_REQUEUE_PI
Remove __FAVOR_BSD.
Remove libbsd-compat dummy library.
Remove various unused files from sysdeps/unix/bsd/.
* manual/time.texi (TZ Variable): POSIX.1 hour can be 24.
* manual/time.texi (TZ Variable): Modernize North America example

to reflect current (i.e., 2007-and-later) daylight saving rules.
Document TZ transition times >= 25:00:00.

* manual/time.texi (TZ Variable): Document transition times from
25:00:00 through 167:59:59.  These are already supported, and this
support will help with version-3 tz-format files.
Support TZ transition times < 00:00:00.

This is needed for version-3 tz-format files; it supports time
stamps past 2037 for America/Godthab (the only entry in the tz
database for which this change is relevant).
* manual/time.texi (TZ Variable): Document transition times
from -167:59:59 through -00:00:01.
* time/tzset.c (tz_rule): Time of day is now signed.
(__tzset_parse_tz): Parse negative time of day.
Remove unused files from sysdeps/unix/bsd/bsd4.4/bits/.