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/leaps.nix

@@ -0,0 +1,32 @@
+import ./make-test-python.nix ({ pkgs,  ... }:
+
+{
+  name = "leaps";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ qknight ];
+  };
+
+  nodes =
+    {
+      client = { };
+
+      server =
+        { services.leaps = {
+            enable = true;
+            port = 6666;
+            path = "/leaps/";
+          };
+          networking.firewall.enable = false;
+        };
+    };
+
+  testScript =
+    ''
+      start_all()
+      server.wait_for_open_port(6666)
+      client.wait_for_unit("network.target")
+      assert "leaps" in client.succeed(
+          "${pkgs.curl}/bin/curl -f http://server:6666/leaps/"
+      )
+    '';
+})