- 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

Do a bunch of fixing and refactoring.

Fix up gzip to crunch right.

Add kenv, although I'm not yet sure why it isn't working on my MIPS
boards (reading kenv always returns blank.)

Disable fsck_ffs for now, 4MB target size issues.

Disable building textproc for now, it doesn't fit on my 4MB flash
partition.

Add -lcrypt as a dynamic target.

For now, disable building wpa_supplicant.

My 4MB flash builds can't handle the bloat.

Import the first cut of "bsdbox".

This uses the existing crunchgen infrastructure to build
a series of tools designed to replace the base and networking
tools on an embedded system.

It reuses 'bsd.crunchgen.mk' to drive the actual file
creation. The rescue build system also uses this.

Unlike busybox, it doesn't include its own source - instead,
it just builds from the sources in /usr/src/ and leverages
the existing BSD framework.

Thie is still quite messy and could do with a whole lot of
cleaning up. However it is proving to be very useful with
my current build framework, allowing me to build binary root
images that are about 30% less than simply cherrypicking files
and libraries from an installworld.