- Copy stable/10@285827 to releng/10.2 in preparation for 10.2-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.2.
- Update default pkg(8) configuration to use the quarterly branch.[1]

Discussed with: re, portmgr [1]
Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Oops, the weak reference for ceill(), floorl() and truncl() was in the
wrong file. This broke arm and powerpc.

Reported by: grehan

s_ceill.c
s_floorl.c
s_truncl.c

On arches where long double is the same as double, alias ceil(), floor()
and trunc() to the corresponding long double functions. This is not
just an optimization for these arches. The full long double functions
have a wrong value for `huge', and the arches without full long doubles
depended on it being wrong.

Revert the last change, the conversion from long double to double can raise
unwanted underflow exceptions.

Pointed out by: das

Use double additions to raise the inexact exception to work around problems
with long double addition on sparc64.

Fix raising the inexact exception (FE_INEXACT) if the result differs from the
argument.

Noticed by: das

Implement floorl().