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

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

Revert r256095, r256120 (partial), r256121:

r256095:
- Add gnu/usr.bin/rcs back to the base system.

r256120:
- Add WITHOUT_RCS back to src.conf.5.

r256121:
- Remove UPDATING entry regarding gnu/usr.bin/rcs removal.

Requested by: many
Approved by: re (marius)
Discussed with: core

Remove kludges intended to support src trees with partial obj trees.

Discussed with: ru

Bring in my changes for removing the pestilent obj links (unless you
really want them) from /usr/src. This is the final version of the
patches, incorporating the feedback I've received from -current.

Update makefiles:
centralize obj/noobj conditional in Makefile.inc
use DPADD
don't compile profiling library
install rcsfreeze correctly
After this commit, the freebsd and netbsd rcs distribution will be in sync.

This commit was generated by cvs2svn to compensate for changes in r9,
which included commits to RCS files with non-trunk default branches.

Updated GNU utilities