platforms/mpi: New MPI ABI "MPIABI" #12780
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The MPI standard 5.0 provides an official ABI for MPI. Both major MPI implementations (MPICH and OpenMPI) will soon release new versions which can, optionally, provide this ABI. In the far future I foresee us targeting just this ABI and not having to deal with the other ABIs.
This PR makes MPI-using packages understand this ABI. The package
MPIABI_jllalready provides this ABI, using a beta version of MPICH 5.0.0.