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/xautolock.nix

@@ -0,0 +1,24 @@
+import ./make-test-python.nix ({ pkgs, lib, ... }:
+
+with lib;
+
+{
+  name = "xautolock";
+  meta.maintainers = with pkgs.lib.maintainers; [ ];
+
+  nodes.machine = {
+    imports = [ ./common/x11.nix ./common/user-account.nix ];
+
+    test-support.displayManager.auto.user = "bob";
+    services.xserver.xautolock.enable = true;
+    services.xserver.xautolock.time = 1;
+  };
+
+  testScript = ''
+    machine.start()
+    machine.wait_for_x()
+    machine.fail("pgrep xlock")
+    machine.sleep(120)
+    machine.succeed("pgrep xlock")
+  '';
+})