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

For variables that are only checked with defined(), don't provide
any fake value.

Removed now unused INTERNALSTATICLIB.
INTERNALLIB now implies NOPIC and NOPROFILE.
Removed gratuitous NOMAN.

After looking around at what the other *BSD's do for their $xxxBSD$ tags,
take the easy way out and implement the beginnings of something similar.
Don't worry, the code here is *dormant* so far, some "help" from cvs is
required. This is going in now so that jdp can see what I'm working on.
This is an extension of the previous existing skeleton $FreeBSD$ code.

First part of import conflict merge from rcs-5.7 import.

All those $Log$ entries, combined with the whitespace changes are a real
pain.

I'm committing this now, before it's completely finished to get it compiling
and working again ASAP. Some of the FreeBSD specific features are not working
in this commit yet (mainly rlog stuff and $FreeBSD$ support)

No longer use FSYNC_ALL by default, we do not have the stability problems
with the system as we once did. This should greatly increase the speed
of rcs and therefore cvs.

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.

We don't need librcs.a in /usr/lib, so make install not do anything

Added Chris Demetriou's FSYNC_ALL option which causes all writes to be
flushed immediately. (In case of a crash in the middle of CVS/RCS commits

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