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/flask-gravatar/default.nix

@@ -0,0 +1,47 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, flask
+, pytestCheckHook
+, pygments
+}:
+
+buildPythonPackage rec {
+  pname = "flask-gravatar";
+  version = "0.5.0";
+
+  src = fetchPypi {
+    pname = "Flask-Gravatar";
+    inherit version;
+    sha256 = "YGZfMcLGEokdto/4Aek+06CIHGyOw0arxk0qmSP1YuE=";
+  };
+
+  postPatch = ''
+    sed -i setup.py \
+     -e "s|tests_require=tests_require,||g" \
+     -e "s|extras_require=extras_require,||g" \
+     -e "s|setup_requires=setup_requires,||g"
+    # pep8 is deprecated and cov not needed
+    substituteInPlace pytest.ini \
+     --replace "--pep8" "" \
+     --replace "--cov=flask_gravatar --cov-report=term-missing" ""
+  '';
+
+  propagatedBuildInputs = [
+    flask
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+    pygments
+  ];
+
+  pythonImportsCheck = [ "flask_gravatar" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/zzzsochi/Flask-Gravatar";
+    description = "Small and simple integration of gravatar into flask";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ gador ];
+  };
+}