message: Add ifdef around MPI_Init
diff: @@ -2591,7 +2591,7 @@ int main(int argc, char** argv)
  "GASNet MPI conduit or the Realm MPI network layer "
  "with the Legion-MPI Interop!\n");
  assert(provided == MPI_THREAD_MULTIPLE);
  -#else
  +#elif defined(FF_ENABLE_NCCL)
  // Perform MPI start-up like normal for most GASNet conduits
  MPI_Init(&argc, &argv);
  #endif
  