- 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

Remove opt_mac.h generation for various kernel modules that no longer
require it.

Submitted by: pjd

Reimplementation of world/kernel build options. For details, see:

http://lists.freebsd.org/pipermail/freebsd-current/2006-March/061725.html

The src.conf(5) manpage is to follow in a few days.

Brought to you by: imp, jhb, kris, phk, ru (all bugs are mine)

When compiling with the kernel, detect if INET6 support should be disabled.

In this case, disable wrapping of fake opt_*.h targets in
"if defined(KERNBUILDDIR)" for now since the new way of
building modules with the kernel can't handle dynamic SRCS
depending on build options yet.

Let modules use the kernel's opt_*.h files if built along with
the kernel by wrapping all targets for fake opt_*.h files in
.if defined(KERNBUILDDIR). Thus, such fake files won't be
created at all if modules are built with the kernel.

Some modules undergo cleanup like removing unused or unneeded
options or .h files, without which they wouldn't build this way
or the other.

Reviewed by: ru
Tested by: no binary changes in modules built alone
Tested on: i386 sparc64 amd64

NOINET6 -> NO_INET6

kmod.mk knows how to create empty opt_*.h files so let it deal with the
NOINET6 case.

Reported by: ru

Allow the gif module to be built without IPv6 support when NOINET6 is
defined.

Submitted by: mitrohin a.s. <swp at uni-altai dot ru>

Depend on opt_mac.h.

Drop <bsd.man.mk> support from <bsd.kmod.mk>.

Not objected to by: -current

gif(4) and stf(4) modernization:

- Remove gif dependencies from stf.
- Make gif and stf into modules
- Make gif cloneable.

PR: kern/27983
Reviewed by: ru, ume
Obtained from: NetBSD
MFC after: 1 week