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/txredisapi.nix

@@ -0,0 +1,29 @@
+import ./make-test-python.nix ({ pkgs, ... }:
+{
+  name = "txredisapi";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ dandellion ];
+  };
+
+  nodes = {
+    machine =
+      { pkgs, ... }:
+
+      {
+        services.redis.servers."".enable = true;
+
+        environment.systemPackages = with pkgs; [ (python38.withPackages (ps: [ ps.twisted ps.txredisapi ps.mock ]))];
+      };
+  };
+
+  testScript = { nodes, ... }: let
+    inherit (nodes.machine.config.services) redis;
+    in ''
+    start_all()
+    machine.wait_for_unit("redis")
+    machine.wait_for_file("${redis.servers."".unixSocket}")
+    machine.succeed("ln -s ${redis.servers."".unixSocket} /tmp/redis.sock")
+
+    tests = machine.succeed("PYTHONPATH=\"${pkgs.python3Packages.txredisapi.src}\" python -m twisted.trial ${pkgs.python3Packages.txredisapi.src}/tests")
+  '';
+})