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/contexttimer/default.nix

@@ -0,0 +1,42 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, mock
+, fetchpatch
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "contexttimer";
+  version = "unstable-2019-03-30";
+
+  src = fetchFromGitHub {
+    owner = "brouberol";
+    repo = "contexttimer";
+    rev = "a866f420ed4c10f29abf252c58b11f9db6706100";
+    sha256 = "sha256-Fc1vK1KSZWgBPtBf5dVydF6dLHEGAOslWMV0FLRdj8w=";
+  };
+
+  patches = [
+  # https://github.com/brouberol/contexttimer/pull/16
+    (fetchpatch {
+      url = "https://github.com/brouberol/contexttimer/commit/dd65871f3f25a523a47a74f2f5306c57048592b0.patch";
+      hash = "sha256-vNBuFXvuvb6hWPzg4W4iyKbd4N+vofhxsKydEkc25E4=";
+    })
+  ];
+
+  pythonImportsCheck = [ "contexttimer" ];
+
+  checkInputs = [ mock ];
+
+  checkPhase = ''
+    ${python.interpreter} -m unittest tests/test_timer.py
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/brouberol/contexttimer";
+    description = "A timer as a context manager";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ atila ];
+  };
+}