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/envoy.nix

@@ -0,0 +1,33 @@
+import ./make-test-python.nix ({ pkgs, lib, ...} : {
+  name = "envoy";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ cameronnemo ];
+  };
+
+  nodes.machine = { pkgs, ... }: {
+    services.envoy.enable = true;
+    services.envoy.settings = {
+      admin = {
+        access_log_path = "/dev/null";
+        address = {
+          socket_address = {
+            protocol = "TCP";
+            address = "127.0.0.1";
+            port_value = 9901;
+          };
+        };
+      };
+      static_resources = {
+        listeners = [];
+        clusters = [];
+      };
+    };
+  };
+
+  testScript = ''
+    machine.start()
+    machine.wait_for_unit("envoy.service")
+    machine.wait_for_open_port(9901)
+    machine.wait_until_succeeds("curl -fsS localhost:9901/ready")
+  '';
+})