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>

pkgs/test/cc-wrapper/nostdinc-main.c

@@ -0,0 +1,8 @@
+// This one should not come from libc because of -nostdinc
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+  // provided by our own stdio.h
+  foo();
+  return 0;
+}