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/yacs/default.nix

@@ -0,0 +1,32 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, python
+, pyyaml
+}:
+
+buildPythonPackage rec {
+  pname = "yacs";
+  version = "0.1.8";
+
+  src = fetchFromGitHub {
+    owner = "rbgirshick";
+    repo = "yacs";
+    rev = "v${version}";
+    sha256 = "sha256-nO8FL4tTkfTthXYXxXORLieFwvn780DDxfrxC9EUUJ0=";
+  };
+
+  propagatedBuildInputs = [ pyyaml ];
+
+  pythonImportsCheck = [ "yacs" ];
+  checkPhase = ''
+    ${python.interpreter} yacs/tests.py
+  '';
+
+  meta = with lib; {
+    description = "Yet Another Configuration System";
+    homepage = "https://github.com/rbgirshick/yacs";
+    license = licenses.apsl20;
+    maintainers = with maintainers; [ lucasew ];
+  };
+}