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/pygal/default.nix

@@ -0,0 +1,59 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, fetchpatch
+, isPyPy
+, flask
+, pyquery
+, pytest
+, pytest-runner
+, cairosvg
+, tinycss
+, cssselect
+, lxml
+}:
+
+buildPythonPackage rec {
+  pname = "pygal";
+  version = "3.0.0";
+
+  doCheck = !isPyPy; # one check fails with pypy
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-KSP5XS5RWTCqWplyGdzO+/PZK36vX8HJ/ruVsJk1/bI=";
+  };
+
+  buildInputs = [
+    flask
+    pyquery
+
+    # Should be a check input, but upstream lists it under "setup_requires".
+    # https://github.com/Kozea/pygal/issues/430
+    pytest-runner
+  ];
+
+  checkInputs = [
+    pytest
+  ];
+
+  preCheck = ''
+    # necessary on darwin to pass the testsuite
+    export LANG=en_US.UTF-8
+  '';
+
+  postPatch = ''
+    substituteInPlace setup.cfg --replace "[pytest]" "[tool:pytest]"
+  '';
+
+  propagatedBuildInputs = [ cairosvg tinycss cssselect ]
+    ++ lib.optionals (!isPyPy) [ lxml ];
+
+  meta = with lib; {
+    description = "Sexy and simple python charting";
+    homepage = "http://www.pygal.org";
+    license = licenses.lgpl3Plus;
+    maintainers = with maintainers; [ sjourdois ];
+  };
+
+}