- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Add assembly versions of remquol() and remainderl().

Hook up sqrtl() to the build.

Use hardware remainder on amd64 since it is 5 to 10 times faster than
software remainder and is already used for remquo().

Implement rintl(), nearbyintl(), lrintl(), and llrintl().
Thanks to bde@ for feedback and testing of rintl().

Add logbl(3) to libm.

Add symbol versioning to libm.

More optimized math functions.

Implement and document remquo() and remquof().

Define the LDBL_PREC to be the number of significant bits in a long
double's mantissa.

Move machine-dependent crud to its own makefile.