add -m64 to CC, not EXTRA_KCFLAGS as that doesn't get passed to the
"stage two" of module building

 - Alternate handling of different OS w/ libcfs and portals headers
 - Add support to the auto* build for building darwin kexts
 - Move libcfs headers to libcfs
 - misc build fixes to build on darwin / x86, and to get liblustre
   building again

If your b_port_* or other branch is broken after updating, please
email me.

add -m64 to EXTRA_KCFLAGS as well, to work around bugs in the linux
ppc64 makefiles

r=adilger

use -m64 for userspace when the compiler supports it.

This is needed on 64-bit systems where the default compiler is 32-bit
(SLES 9 on ppc64).

look for libsysio in lib, not src

 * get rid of LC_{DARWIN,LINUX}_SUPPORTED in favor of more general
   LC_TARGET_SUPPORTED
 * fix some typos and spacings

 - change fshooks tests to work on HEAD (and better in general)
 - fix init script tests

 - build/autoconf/configure.ac: main skel
 - build/autoconf/lustre-build.m4: non-arch macros
 - build/autoconf/lustre-build-linux.m4: linux-specific macros
 - build/autoconf/lustre-build-darwin.m4: darwin-specific macros
 - portals/autoconf/lustre-portals.m4: portals checks
 - lustre/autoconf/lustre-core.m4: lustre checks
 - lustre/autoconf/lustre-version.ac: the canonical lustre version