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>

pkgs/servers/xandikos/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, fetchFromGitHub
+, python3Packages
+, nixosTests
+}:
+
+python3Packages.buildPythonApplication rec {
+  pname = "xandikos";
+  version = "0.2.8";
+
+  src = fetchFromGitHub {
+    owner = "jelmer";
+    repo = "xandikos";
+    rev = "v${version}";
+    sha256 = "sha256-KDDk0QSOjwivJFz3vLk+g4vZMlSuX2FiOgHJfDJkpwg=";
+  };
+
+  propagatedBuildInputs = with python3Packages; [
+    aiohttp
+    dulwich
+    defusedxml
+    icalendar
+    jinja2
+    multidict
+    prometheus-client
+  ];
+
+  passthru.tests.xandikos = nixosTests.xandikos;
+
+  checkInputs = with python3Packages; [ pytestCheckHook ];
+  disabledTests = [
+    # these tests are failing due to the following error:
+    # TypeError: expected str, bytes or os.PathLike object, not int
+    "test_iter_with_etag"
+    "test_iter_with_etag_missing_uid"
+  ];
+
+  meta = with lib; {
+    description = "Lightweight CalDAV/CardDAV server";
+    homepage = "https://github.com/jelmer/xandikos";
+    license = licenses.gpl3Plus;
+    changelog = "https://github.com/jelmer/xandikos/blob/v${version}/NEWS";
+    maintainers = with maintainers; [ _0x4A6F ];
+  };
+}