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/keyrings-alt/default.nix

@@ -0,0 +1,41 @@
+{ lib, buildPythonPackage, fetchPypi, pythonOlder, isPy27, six
+, pytest, backports_unittest-mock, keyring, setuptools-scm
+}:
+
+buildPythonPackage rec {
+  pname = "keyrings.alt";
+  version = "4.1.0";
+  disabled = isPy27;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "52ccb61d6f16c10f32f30d38cceef7811ed48e086d73e3bae86f0854352c4ab2";
+  };
+
+  postPatch = ''
+    substituteInPlace pytest.ini \
+      --replace "--flake8" ""
+  '';
+
+  nativeBuildInputs = [ setuptools-scm ];
+  propagatedBuildInputs = [ six ];
+
+  checkInputs = [ pytest keyring ] ++ lib.optional (pythonOlder "3.3") backports_unittest-mock;
+
+  # heavily relies on importing tests from keyring package
+  doCheck = false;
+  checkPhase = ''
+    py.test
+  '';
+
+  pythonImportsCheck = [
+    "keyrings.alt"
+  ];
+
+  meta = with lib; {
+    license = licenses.mit;
+    description = "Alternate keyring implementations";
+    homepage = "https://github.com/jaraco/keyrings.alt";
+    maintainers = with maintainers; [ nyarly ];
+  };
+}