Remove num_pes,my_pe declarations from shmem.fh.

The openshmem test suite
(http://bongo.cs.uh.edu/site/sites/default/site_files/openshmem-test-suite-release-1.0d.tar.bz2)
declares num_pes and my_pe in each Fortran test file -- it apparently
doesn't expect shmem.fh to declare these functions.  Sigh.

cmr=v1.7.5:reviewer=miked:subject=the openshmem community is crazy