ENH: makeVTK -mpi also define VTK_Group_MPI=ON

- this pulls in the other bits (Module_vtkParallelMPI,
  Module_vtkRenderingParallel, ...)

makeVTK.example

@@ -7,24 +7,17 @@ vtk=VTK-9.0.0
 # mesa=mesa-13.0.3
 mesa=mesa-17.1.1
 
-# Request building MPI modules
-# VTK_Group_MPI=ON
+# Module_vtkAcceleratorsVTKm    : Request building vtkAcceleratorsVTKm
 #
-# Request building vtkAcceleratorsVTKm
-# Module_vtkAcceleratorsVTKm=OFF
-#
-# Request building vtkParallelMPI
-# Module_vtkParallelMPI=ON
+# -mpi implies VTK_Group_MPI    : Request building MPI modules
 
 set -x
 ./makeVTK \
-    -mpi=0 \
+    -mpi  \
     -osmesa \
     -mesa-prefix $WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$mesa \
     $vtk "$@" \
-    VTK_Group_MPI=ON \
-    Module_vtkAcceleratorsVTKm=ON \
-    Module_vtkParallelMPI=ON
+    Module_vtkAcceleratorsVTKm=ON
 
 
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