- 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)

MFC r282115, r282152, r282201
MFV r282150
libgomp: Update to version 4.3.5.
bring initial BSD support from upstream.

This was not meant to be MFC'd at first but the original OMP support
for FreeBSD was in very poor shape. The effect of this change should
be minimal as all ports are already using the version of libgomp that
comes with the gcc ports. The local libgomp is planned to be disabled
for platforms that are not using older gcc by default so this version
of libgomp will not be shipped in tier-1 platform releases.

Discussed with: emaste

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

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

Turn on TLS support for arm on here as it is supported since r231618/
r231619 and working since r233106.

Now that TLS is supported for sparc64 by both binutils 2.17.50 committed
in r218822 and rtld(1) committed in r219533 turn on TLS support in GCC.

Add FreeBSD/MIPS support to GCC.

Update bmake glue to build GCC 4.2.

Also:
Switch FreeBSD to use libgcc_s.so.1.

Use dl_iterate_phdr to locate shared objects' exception frame
info instead of depending on older register_frame_info machinery.
This allows us to avoid depending on libgcc_s.so.1 in binaries
that do not use exception handling directly. As an additional
benefit it breaks circular libc <=> libgcc_s.so.1 dependency too.

Build newly added libgomp.so.1 library, the runtime support
bits for OpenMP.

Build LGPLed libssp library. Our libc provides our own
BSD-licensed SSP callbacks implementation, so this library
is only built to benefit applications that have hadcoded
knowledge of libssp.so and libssp_nonshared.a. When linked
in from command line, these libraries override libc
implementation.