vtkmpi: Expand no-cpp defines to cover SGI MPT

Utilities/MPI/CMakeLists.txt

@@ -14,6 +14,7 @@ vtk_module_definitions(VTK::mpi
   INTERFACE
     MPICH_SKIP_MPICXX
     OMPI_SKIP_MPICXX
+    MPI_NO_CPPBIND
     _MPICC_H)
 
 if (APPLE AND TARGET MPI::MPI_C)

Utilities/MPI/vtk_mpi.h

@@ -16,6 +16,12 @@
 #define _vtk_mpi_ibm
 #endif
 
+// Skip SGI MPT's C++ support.
+#ifndef MPI_NO_CPPBIND
+#define MPI_NO_CPPBIND
+#define _vtk_mpi_sgi
+#endif
+
 // Include the MPI header.
 #include <mpi.h>
 
@@ -34,3 +40,8 @@
 #undef _MPICC_H
 #undef _vtk_mpi_ibm
 #endif
+
+#ifdef _vtk_mpi_sgi
+#undef MPI_NO_CPPBIND
+#undef _vtk_mpi_sgi
+#endif