- 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 r292328:

Integrate a number of testcases from tools/regression/lib/msun
into the FreeBSD test suite

There's no functional change with these testcases; they're purposely
being left in TAP format for the time being

Other testcases which crash on amd64/i386 as-is have not been
integrated yet (they need to be retested on a later version of
CURRENT, as I haven't used i386 in some time)

Integrate a number of testcases from tools/regression/lib/msun
into the FreeBSD test suite

There's no functional change with these testcases; they're purposely
being left in TAP format for the time being

Other testcases which crash on amd64/i386 as-is have not been
integrated yet (they need to be retested on a later version of
CURRENT, as I haven't used i386 in some time)

MFC after: 3 weeks
Sponsored by: EMC / Isilon Storage Division

- Replace N(a)/N(i)/N(T)/LEN(a)/ARRAY_SIZE(a) with nitems()
- Add missing <err.h> for err() and <sys/sysctl.h> for sysctlbyname()
- NULL -> 0 for 5th parameter of sysctlbyname()

Submitted by: Andriy Voskoboinyk <s3erios@gmail com>
Differential Revision: https://reviews.freebsd.org/D3442

Be ANSI-C compliant when defining CX_LIMITED_RANGE #pragma

This mutes warnings with clang

Approved by: rpaulo (mentor)
Reviewed by: das, kargl (both as part of a larger patch)
Phabric: D742
Sponsored by: EMC / Isilon Storage Division

Factor out some common code from the libm tests. This is a bit messy
because different tests have different ideas about what it means to be
"close enough" to the right answer, depending on the properties of the
function being tested. In the process, I fixed some warnings and
added a few more 'volatile' hacks, which are sufficient to make all
the tests pass at -O2 with clang.

Add some minimal tests for csqrtl().

Regression tests for csqrt(3).