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/oslo-config/tests.nix

@@ -0,0 +1,41 @@
+{ buildPythonPackage
+, oslo-config
+, docutils
+, oslo-log
+, oslotest
+, requests-mock
+, sphinx
+, stestr
+, testscenarios
+}:
+
+buildPythonPackage rec {
+  pname = "oslo-config-tests";
+  inherit (oslo-config) version;
+
+  src = oslo-config.src;
+
+  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
+  '';
+
+  dontBuild = true;
+  dontInstall = true;
+
+  checkInputs = [
+    oslo-config
+    docutils
+    oslo-log
+    oslotest
+    requests-mock
+    sphinx
+    stestr
+    testscenarios
+  ];
+
+  checkPhase = ''
+    stestr run
+  '';
+}