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/mypy/extensions.nix

@@ -0,0 +1,34 @@
+{ lib
+, fetchFromGitHub
+, buildPythonPackage
+, typing
+, python
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "mypy-extensions";
+  version = "0.4.3";
+
+  src = fetchFromGitHub {
+    owner = "python";
+    repo = "mypy_extensions";
+    rev = version;
+    sha256 = "sha256-JjhbxX5DBAbcs1o2fSWywz9tot792q491POXiId+NyI=";
+  };
+
+  propagatedBuildInputs = lib.optional (pythonOlder "3.5") typing;
+
+  checkPhase = ''
+    ${python.interpreter} -m unittest discover tests
+  '';
+
+  pythonImportsCheck = [ "mypy_extensions" ];
+
+  meta = with lib; {
+    description = "Experimental type system extensions for programs checked with the mypy typechecker";
+    homepage = "http://www.mypy-lang.org";
+    license = licenses.mit;
+    maintainers = with maintainers; [ martingms lnl7 SuperSandro2000 ];
+  };
+}