scripts/MPI/build_all_variants: exit on error

scripts/MPI/build_all_variants

@@ -17,6 +17,7 @@ for cc in "${COMPILER_VERSIONS[@]}"; do
 			echo "Oops: build failed for:"
 			echo "        compiler: $cc"
 			echo "        mpi:      $mpi"
+			exit 1
 			}
 	done
 done