configury: fix lt_dladvise_init grep test

Change the CPPFLAGS to just -I$srcdir, and change the include file to
check to be just opal/libltdl/ltdl.h.  Do this because the CPPFLAGS
are passed to the preprocessor, and the C program that is passed
through the preprocessor is basically:

    #include <opal/libltdl/ltdl.h>

Using the proper -I covers both VPATH and non-VPATH cases.
configury: whitespace and shell quoting cleanup

Remove extra whitespace, change foo="$bar" to foo=$bar,
and change one instance of "$foo" = "1" to $foo -eq 1.
Merge pull request #298 from jsquyres/topic/lt_dladvise-fix

Fix the lt_dladvise test noted by Edgar
Fix singletons - still working on singleton comm_spawn
configury: add "./configure V=1" verbose mode

Currently only shows whether opal_mca.m4 decides whether to build a
component or not.  This will be helpful in debugging a remote user's
setup that somehow, mysteriously decides not to build a specific
component.
Add "-I$srcdir/opal/libltdl/" so conftest will allways set lt_dladvise.
Merge pull request #301 from artpol84/lt_dladvise

Add  "-I$srcdir/opal/libltdl/" so conftest will allways set lt_dladvise.
Minor changes per Jeff's request on PR for 1.8.4
Increment the init_count in the Slurm pmix components so they correctly respond to calls to pmix.initialized
OSHMEM: spml ikrit: add skew to connect/disconnect

Each pe connects/disconnects starting from itself instead of pe=0. This
will distribute network traffic in a more friendly way.
Revert "If someone specifically asks for knem support and we can't do it, then we really should abort."

This reverts commit 6287d43c475fe6de6e3e44cbc3fdbe4f7e08e9a2.
Cleanup static build requirements by adding the wrapper flags back to the component configure.m4's. Minor cleanup of the lsf configure logic.
Fix a race condition that only appears to be affecting certain setups. The pmix.finalize function closes the file descriptor to the server, which then triggers the errhandler callback. Since the errmgr is about to be unloaded, it might be getting hit.
Portals4 BTL: Do not disqualify if a peer does not put Portals4 BTL modex info

If OPAL_MODEX_RECV() returns OPAL_ERR_NOT_FOUND, the peer didn't
send any Portals4 BTL info.  This is not a fatal error.  Instead of
disqualifying the Portals4 BTL just ignore that peer.

@jsquyres reported this in #194.
Add support for 128-bit compare and swap on x86_64 when available.

A 128-bit compare-and-swap will enable a better atomic lifo implementation
that uses the pointer + counter method to avoid ABA issues. This commit
adds configury to check for the instruction (cmpxchg16b) and adds an
implementation that uses the __int128 type available in C99.