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/applications/misc/hello/test.nix

@@ -0,0 +1,8 @@
+{ runCommand, hello }:
+
+runCommand "hello-test-run" {
+  nativeBuildInputs = [ hello ];
+} ''
+  diff -U3 --color=auto <(hello) <(echo 'Hello, world!')
+  touch $out
+''