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/environs/default.nix

@@ -0,0 +1,49 @@
+{ lib
+, buildPythonPackage
+, dj-database-url
+, dj-email-url
+, django-cache-url
+, fetchFromGitHub
+, marshmallow
+, pytestCheckHook
+, python-dotenv
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "environs";
+  version = "9.5.0";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchFromGitHub {
+    owner = "sloria";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-hucApIn7ul7+MC2W811VTxZNO8Pqb6HDXz9VRcEdmIc=";
+  };
+
+  propagatedBuildInputs = [
+    marshmallow
+    python-dotenv
+  ];
+
+  checkInputs = [
+    dj-database-url
+    dj-email-url
+    django-cache-url
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [
+    "environs"
+  ];
+
+  meta = with lib; {
+    description = "Python modle for environment variable parsing";
+    homepage = "https://github.com/sloria/environs";
+    license = licenses.mit;
+    maintainers = with maintainers; [ fab ];
+  };
+}