fortran: ensure to specify the shared library version

(cherry picked from commit 1b63129de3a93ae5eb87b2a534131c2ea8ba7824)
fortran: fix the MPI_SIZEOF ABI mess that was introduced in v1.8.2

See ompi/mpi/fortran/README-v1.8-ABI.txt for more details.

tl;dr: Compile a bunch of old MPI_SIZEOF implementation symbols
into libmpi_mpif.la, and also compile a dummy libmpi_usempi.la, if
necessary.
Merge pull request #135 from jsquyres/pr/fortran-sizeof-debacle

Fortran ABI debacle / MPI_SIZEOF