- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

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

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

Remove an unused variable.

Sigh, the weak reference for ceill(), floorl() and truncl() was in
unreachable code due to a missing include. This kept arm and powerpc
broken.

Reported by: sam, grehan

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

Reported by: grehan

Implement trunc() and truncf().