Confirm that mpi4py is working/available on Windows MPI builds

It's reported that with ParaView 5.2, mpi4py wasn't working

variables = get_arrays(inputs[0].GetAttributes(self.GetArrayAssociation()))
from mpi4py import MPI

ImportError
  File "....\paraview\ParaView-5.2.0-Qt4-OpenGL2-MPI-Windows-64bit\bin\lib\site-packages\paraview\calculator.py", line 43, in get_arrays
variables = get_arrays(inputs[0].GetAttributes(self.GetArrayAssociation()))
:
  File "....\paraview\ParaView-5.2.0-Qt4-OpenGL2-MPI-Windows-64bit\bin\lib\site-packages\paraview\calculator.py", line 43, in get_arrays
No module named mpi4py
    from mpi4py import MPI

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