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/libsass/default.nix

@@ -0,0 +1,44 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, libsass
+, six
+, pytestCheckHook
+, werkzeug
+}:
+
+buildPythonPackage rec {
+  pname = "libsass";
+  version = "0.21.0";
+
+  src = fetchFromGitHub {
+    owner = "sass";
+    repo = "libsass-python";
+    rev = version;
+    sha256 = "sha256-4doz3kkRlyfVfeUarYw2tcybeDVeE2jpgmHxFJsPiVc=";
+  };
+
+  buildInputs = [ libsass ];
+
+  propagatedBuildInputs = [ six ];
+
+  preBuild = ''
+    export SYSTEM_SASS=true;
+  '';
+
+  checkInputs = [
+    pytestCheckHook
+    werkzeug
+  ];
+
+  pytestFlagsArray = [ "sasstests.py" ];
+
+  pythonImportsCheck = [ "sass" ];
+
+  meta = with lib; {
+    description = "Python binding for libsass to compile Sass/SCSS";
+    homepage = "https://sass.github.io/libsass-python/";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}