Fix bugs in both r27817 and r27821.  For some reason, I removed the conditional
around OMPI_SETUP_MPI_FORTRAN in r27817 when removing the OPAL hacks for the
no-Fortran case.  Then r27821 worked around a build issue caused by
r27817 in a sub-optimal way.
After discussion with Jeff, don't do C++ inline assembly (there is a non-inline
version still avaiable for C++).  This is yet another push to try to make
OPAL a C only interface...