Check for presence of kernel sources before we check for $LINUX/.config
to avoid confusing (and common) error message that $LINUX/.config could
not be found (normally because kernel is not configured and not because
incorrect path was given to configure).

Landing LNET (b1_4_newconfig)

Fix build breakage introduced by lnet reorg.
Completely removed changes until something more compatable can be designed.

Backed out changes to build tree:
autogen.sh                      reverted back to rev 1.4
autoMakefile.am.toplevel        reverted back to rev 1.8
buildcvs                        reverted back to rev 1.44
Makefile.in.toplevel            reverted back to rev 1.1
autoconf/lustre-build-darwin.m4 reverted back to rev 1.8
autoconf/lustre-build-linux.m4  reverted back to rev 1.15
autoconf/lustre-build.m4        reverted back to rev 1.28

Phase 1 of LNET Reorg
r=eeb
r=pjk

    socknal + qswnal changes to match
    simplified "will this be forwarded" predicate in ptl_send()

*   fixed bug in multi-instance socknal to pass the correct NI to the tx
    teardown function to allow for the case where the tx hasn't even had a conn
    assigned yet.

*   fixed routerstat stats formatting

*   removed osc::check_elan_limit() and replaced with max_unfragmented_pages()
    which actually works.  NB it depend on the assumption that file and page
    offsets are aligned!

*   fixed lconf to stay away from portals, except to 'modprobe' for it first in
    'load_module()', and to rmmod all the NALs + portals when ptlrpc gets
    unloaded.

r=adilger

require CONFIG_STACK_SIZE_16KB on i386 + x86_64 non-UML

add LB_CHECK_FILE(S), which work while cross-compiling.

add check for sys/ioctl.h that was missed when moving to portals-split.

(also fix longstanding typo when checking for running kernel header)

 - 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.

 * 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