Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix picobsd builds. Changes include:
- use proper make configuration for the build, using
${BINMAKE} as evaluated by ${VERSION}/src/Makefile
- remove -lmytinfo from crunch.conf
- remove support for login_access in tinyware/login
- remove "machine i386" from the kernel config file

It might actually be interesting to extend the script to do
a cross build for !i386 ...

MFC after: 3 days

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)

NOPAM -> NO_PAM

Introduce the PRECIOUSPROG knob in bsd.prog.mk, similar
to PRECIOUSLIB from bsd.lib.mk. The side effect of this
is making installing the world under jail(8) possible by
using another knob, NOFSCHG.

Reviewed by: oliver

NEED_LIBNAMES is gone long ago.

Add customised version of login for picobsd images on -CURRENT.
This version is basically the same one as login.c 1.67, and does
not require the use of PAM.