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/airsonic.nix

@@ -0,0 +1,28 @@
+import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "airsonic";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ sumnerevans ];
+  };
+
+  nodes.machine =
+    { pkgs, ... }:
+    {
+      services.airsonic = {
+        enable = true;
+        maxMemory = 800;
+      };
+    };
+
+  testScript = ''
+    def airsonic_is_up(_) -> bool:
+        return machine.succeed("curl --fail http://localhost:4040/login")
+
+
+    machine.start()
+    machine.wait_for_unit("airsonic.service")
+    machine.wait_for_open_port(4040)
+
+    with machine.nested("Waiting for UI to work"):
+        retry(airsonic_is_up)
+  '';
+})