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/development/python-modules/convertdate/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pymeeus
+, pytz
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "convertdate";
+  version = "2.4.0";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
+
+  src = fetchFromGitHub {
+    owner = "fitnr";
+    repo = pname;
+    rev = "v${version}";
+    hash = "sha256-iOHK3UJulXJJR50nhiVgfk3bt+CAtG3BRySJ8DkBuJE=";
+  };
+
+  propagatedBuildInputs = [
+    pymeeus
+    pytz
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "convertdate"
+  ];
+
+  meta = with lib; {
+    description = "Utils for converting between date formats and calculating holidays";
+    homepage = "https://github.com/fitnr/convertdate";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jluttine ];
+  };
+}