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/build-support/testers/test/default.nix

@@ -0,0 +1,27 @@
+{ testers, lib, pkgs, ... }:
+let
+  pkgs-with-overlay = pkgs.extend(final: prev: {
+    proof-of-overlay-hello = prev.hello;
+  });
+
+  dummyVersioning = {
+    revision = "test";
+    versionSuffix = "test";
+    label = "test";
+  };
+
+in
+lib.recurseIntoAttrs {
+  # Check that the wiring of nixosTest is correct.
+  # Correct operation of the NixOS test driver should be asserted elsewhere.
+  nixosTest-example = pkgs-with-overlay.testers.nixosTest ({ lib, pkgs, figlet, ... }: {
+    name = "nixosTest-test";
+    nodes.machine = { pkgs, ... }: {
+      system.nixos = dummyVersioning;
+      environment.systemPackages = [ pkgs.proof-of-overlay-hello figlet ];
+    };
+    testScript = ''
+      machine.succeed("hello | figlet >/dev/console")
+    '';
+  });
+}