
Set mpi.lo dependencies outside of AM conditionals. Per https://github.com/open-mpi/ompi/issues/5085, make mpi.lo depend on whatever we decide the sizeof source files are (which may be empty, if this compiler does not support the Right Stuff for MPI_SIZEOF, or it may be mpi-tkr-sizeof.[h|f90]). Signed-off-by: Jeff Squyres <jsquyres@cisco.com>