- 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 the POSIX 1003.1-2001 posix_madvise() interface.

PR: standards/54634
Reviewed by: das
Approved by: jake (mentor)

Fix SCM ID's.

Add a couple of new library interfaces (will be activated when the
relavant header file changes are committed) for POSIX support.