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/rsyncd.nix

@@ -0,0 +1,36 @@
+import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "rsyncd";
+  meta.maintainers = with pkgs.lib.maintainers; [ ehmry ];
+
+  nodes = let
+    mkNode = socketActivated:
+      { config, ... }: {
+        networking.firewall.allowedTCPPorts = [ config.services.rsyncd.port ];
+        services.rsyncd = {
+          enable = true;
+          inherit socketActivated;
+          settings = {
+            global = {
+              "reverse lookup" = false;
+              "forward lookup" = false;
+            };
+            tmp = {
+              path = "/nix/store";
+              comment = "test module";
+            };
+          };
+        };
+      };
+  in {
+    a = mkNode false;
+    b = mkNode true;
+  };
+
+  testScript = ''
+    start_all()
+    a.wait_for_unit("rsync")
+    b.wait_for_unit("sockets.target")
+    b.succeed("rsync a::")
+    a.succeed("rsync b::")
+  '';
+})