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cmake: set MSMPI_VER when using Microsoft's MPI

David Gobbi requested to merge dgobbi/mpi4py:for/vtk into for/vtk

The mpi4py code expects the preprocessor symbol MSMPI_VER to give the msmpi version in hexadecimal. If this isn't set correctly, then mpi4py on Windows gives errors like the following:

<some type> size changed, may indicate binary incompatibility.
Expected 40 from C header, got 48 from PyObject

The new cmake code gets the msmpi version from the registry, since this is what the mpi4py setup.py script does.

MR for VTK: vtk/vtk!11647 (merged)

Edited by David Gobbi

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