uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/tests/mpich-example.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <mpi.h>
+
+int
+main (int argc, char *argv[])
+{
+  int rank, size, length;
+  char name[BUFSIZ];
+
+  MPI_Init (&argc, &argv);
+  MPI_Comm_rank (MPI_COMM_WORLD, &rank);
+  MPI_Comm_size (MPI_COMM_WORLD, &size);
+  MPI_Get_processor_name (name, &length);
+
+  printf ("%s: hello world from process %d of %d\n", name, rank, size);
+
+  MPI_Finalize ();
+
+  return EXIT_SUCCESS;
+}