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/flake8-length/default.nix

@@ -0,0 +1,37 @@
+{ lib
+, buildPythonPackage
+, pythonOlder
+, flake8
+, pytestCheckHook
+, fetchPypi
+}:
+
+buildPythonPackage rec {
+  pname = "flake8-length";
+  version = "0.3.0";
+  disabled = pythonOlder "3.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "6e3c068005b0b3b5c8345923fe3e9a107c980baa1354dd19d820018f87409427";
+  };
+
+  propagatedBuildInputs = [
+    flake8
+  ];
+
+  pythonImportsCheck = [
+    "flake8_length"
+  ];
+
+  checkInputs = [ pytestCheckHook ];
+
+  pytestFlagsArray = [ "tests/" ];
+
+  meta = {
+    description = "Flake8 plugin for a smart line length validation";
+    homepage = "https://github.com/orsinium-labs/flake8-length";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ sauyon ];
+  };
+}