This patch updates the MPI.jl compat to allow 0.20. In addition, the Clang.jl generator is
updated to filter out all unnecessary bindings (e.g. MPI related) and instead bring in constants
from MPI.jl. This should make sure that those are synced, since everything now uses MPIPreferences.
Co-authored-by: Dennis Ogiermann <termi-official@users.noreply.github.com>
Co-authored-by: Fredrik Ekre <ekrefredrik@gmail.com>