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