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/pbr/tests.nix

@@ -0,0 +1,48 @@
+{ buildPythonPackage
+, build
+, git
+, gnupg
+, pbr
+, sphinx
+, stestr
+, testresources
+, testscenarios
+, virtualenv
+}:
+
+buildPythonPackage rec {
+  pname = "pbr";
+  inherit (pbr) version;
+
+  src = pbr.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 = [
+    pbr
+    build
+    git
+    gnupg
+    sphinx
+    stestr
+    testresources
+    testscenarios
+    virtualenv
+  ];
+
+  checkPhase = ''
+    stestr run -e <(echo "
+    pbr.tests.test_core.TestCore.test_console_script_develop
+    pbr.tests.test_core.TestCore.test_console_script_install
+    pbr.tests.test_wsgi.TestWsgiScripts.test_with_argument
+    pbr.tests.test_wsgi.TestWsgiScripts.test_wsgi_script_run
+    ")
+  '';
+}