Aside from comments, these help files are empty -- so just remove
them. Also remove a few inclusions of show_help.h, since it isn't
used in those source files.
This commit was SVN r31328.
pkg{data,lib,includedir}, use our own ompi{data,lib,includedir}, which is
always set to {datadir,libdir,includedir}/openmpi. This will keep us from
having help files in prefix/share/open-rte when building without Open MPI,
but in prefix/share/openmpi when building with Open MPI.
This commit was SVN r30140.