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/pytest-cov/default.nix

@@ -0,0 +1,39 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pytest
+, coverage
+, toml
+, tomli
+}:
+
+buildPythonPackage rec {
+  pname = "pytest-cov";
+  version = "3.0.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470";
+  };
+
+  buildInputs = [ pytest ];
+
+  propagatedBuildInputs = [ coverage toml tomli ];
+
+  # xdist related tests fail with the following error
+  # OSError: [Errno 13] Permission denied: 'py/_code'
+  doCheck = false;
+  checkPhase = ''
+    # allow to find the module helper during the test run
+    export PYTHONPATH=$PYTHONPATH:$PWD/tests
+    py.test tests
+  '';
+
+  pythonImportsCheck = [ "pytest_cov" ];
+
+  meta = with lib; {
+    description = "Plugin for coverage reporting with support for both centralised and distributed testing, including subprocesses and multiprocessing";
+    homepage = "https://github.com/pytest-dev/pytest-cov";
+    license = licenses.mit;
+  };
+}