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/stestr/default.nix

@@ -0,0 +1,54 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, cliff
+, fixtures
+, future
+, pbr
+, subunit
+, testtools
+, voluptuous
+, callPackage
+}:
+
+buildPythonPackage rec {
+  pname = "stestr";
+  version = "3.2.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-wj7nq0QSKNiDZZBKIk+4RC2gwCifkBz0qUIukpt76c0=";
+  };
+
+  postPatch = ''
+    # only a small portion of the listed packages are actually needed for running the tests
+    # so instead of removing them one by one remove everything
+    rm test-requirements.txt
+  '';
+
+  propagatedBuildInputs = [
+    cliff
+    fixtures
+    future
+    pbr
+    subunit
+    testtools
+    voluptuous
+  ];
+
+  # check in passthru.tests.pytest to escape infinite recursion with other oslo components
+  doCheck = false;
+
+  passthru.tests = {
+    tests = callPackage ./tests.nix { };
+  };
+
+  pythonImportsCheck = [ "stestr" ];
+
+  meta = with lib; {
+    description = "A parallel Python test runner built around subunit";
+    homepage = "https://github.com/mtreinish/stestr";
+    license = licenses.asl20;
+    maintainers = teams.openstack.members;
+  };
+}