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/memcached.nix

@@ -0,0 +1,24 @@
+import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "memcached";
+
+  nodes.machine = {
+    imports = [ ../modules/profiles/minimal.nix ];
+    services.memcached.enable = true;
+  };
+
+  testScript = let
+    testScript = pkgs.writers.writePython3 "test_memcache" {
+      libraries = with pkgs.python3Packages; [ memcached ];
+    } ''
+      import memcache
+      c = memcache.Client(['localhost:11211'])
+      c.set('key', 'value')
+      assert 'value' == c.get('key')
+    '';
+  in ''
+    machine.start()
+    machine.wait_for_unit("memcached.service")
+    machine.wait_for_open_port(11211)
+    machine.succeed("${testScript}")
+  '';
+})