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/iodine.nix

@@ -0,0 +1,64 @@
+import ./make-test-python.nix (
+  { pkgs, ... }: let
+    domain = "whatever.example.com";
+    password = "false;foo;exit;withspecialcharacters";
+  in
+    {
+      name = "iodine";
+      nodes = {
+        server =
+          { ... }:
+
+            {
+              networking.firewall = {
+                allowedUDPPorts = [ 53 ];
+                trustedInterfaces = [ "dns0" ];
+              };
+              boot.kernel.sysctl = {
+                "net.ipv4.ip_forward" = 1;
+                "net.ipv6.ip_forward" = 1;
+              };
+
+              services.iodine.server = {
+                enable = true;
+                ip = "10.53.53.1/24";
+                passwordFile = "${builtins.toFile "password" password}";
+                inherit domain;
+              };
+
+              # test resource: accessible only via tunnel
+              services.openssh = {
+                enable = true;
+                openFirewall = false;
+              };
+            };
+
+        client =
+          { ... }: {
+            services.iodine.clients.testClient = {
+              # test that ProtectHome is "read-only"
+              passwordFile = "/root/pw";
+              relay = "server";
+              server = domain;
+            };
+            systemd.tmpfiles.rules = [
+              "f /root/pw 0666 root root - ${password}"
+            ];
+            environment.systemPackages = [
+              pkgs.nagiosPluginsOfficial
+            ];
+          };
+
+      };
+
+      testScript = ''
+        start_all()
+
+        server.wait_for_unit("sshd")
+        server.wait_for_unit("iodined")
+        client.wait_for_unit("iodine-testClient")
+
+        client.succeed("check_ssh -H 10.53.53.1")
+      '';
+    }
+)