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/spacecookie.nix

@@ -0,0 +1,56 @@
+let
+  gopherRoot   = "/tmp/gopher";
+  gopherHost   = "gopherd";
+  gopherClient = "client";
+  fileContent  = "Hello Gopher!\n";
+  fileName     = "file.txt";
+in
+  import ./make-test-python.nix ({...}: {
+    name = "spacecookie";
+    nodes = {
+      ${gopherHost} = {
+        systemd.services.spacecookie = {
+          preStart = ''
+            mkdir -p ${gopherRoot}/directory
+            printf "%s" "${fileContent}" > ${gopherRoot}/${fileName}
+          '';
+        };
+
+        services.spacecookie = {
+          enable = true;
+          openFirewall = true;
+          settings = {
+            root = gopherRoot;
+            hostname = gopherHost;
+          };
+        };
+      };
+
+      ${gopherClient} = {};
+    };
+
+    testScript = ''
+      start_all()
+
+      # with daemon type notify, the unit being started
+      # should also mean the port is open
+      ${gopherHost}.wait_for_unit("spacecookie.service")
+      ${gopherClient}.wait_for_unit("network.target")
+
+      fileResponse = ${gopherClient}.succeed("curl -f -s gopher://${gopherHost}/0/${fileName}")
+
+      # the file response should return our created file exactly
+      if not (fileResponse == "${builtins.replaceStrings [ "\n" ] [ "\\n" ] fileContent}"):
+          raise Exception("Unexpected file response")
+
+      # sanity check on the directory listing: we serve a directory and a file
+      # via gopher, so the directory listing should have exactly two entries,
+      # one with gopher file type 0 (file) and one with file type 1 (directory).
+      dirResponse = ${gopherClient}.succeed("curl -f -s gopher://${gopherHost}")
+      dirEntries = [l[0] for l in dirResponse.split("\n") if len(l) > 0]
+      dirEntries.sort()
+
+      if not (["0", "1"] == dirEntries):
+          raise Exception("Unexpected directory response")
+    '';
+  })