- More subpackage interdependency adjustments
    - boost doesn't bring in the MPI stuff. Instead, $MPI-devel does. It needs
        to, so that the symlinks don't dangle.
    - boost-graph-$MPI depends on boost-$MPI so that boost-mpich2 doesn't
        satisfy the SONAME dependency of boost-graph-openmpi.
    - Resolves: #559009