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/drf-yasg/default.nix

@@ -0,0 +1,58 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, inflection
+, ruamel-yaml
+, setuptools-scm
+, six
+, coreapi
+, djangorestframework
+, pytestCheckHook
+, pytest-django
+, datadiff
+}:
+
+buildPythonPackage rec {
+  pname = "drf-yasg";
+  version = "1.20.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "d50f197c7f02545d0b736df88c6d5cf874f8fea2507ad85ad7de6ae5bf2d9e5a";
+  };
+
+  postPatch = ''
+    # https://github.com/axnsan12/drf-yasg/pull/710
+    substituteInPlace requirements/base.txt --replace packaging ""
+  '';
+
+  nativeBuildInputs = [
+    setuptools-scm
+  ];
+
+  propagatedBuildInputs = [
+    six
+    inflection
+    ruamel-yaml
+    coreapi
+    djangorestframework
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+    pytest-django
+    datadiff
+  ];
+
+  # ImportError: No module named 'testproj.settings'
+  doCheck = false;
+
+  pythonImportsCheck = [ "drf_yasg" ];
+
+  meta = with lib; {
+    description = "Generation of Swagger/OpenAPI schemas for Django REST Framework";
+    homepage = "https://github.com/axnsan12/drf-yasg";
+    maintainers = with maintainers; [ ];
+    license = licenses.bsd3;
+  };
+}