Make sure setuptools does not create a zip file in python_test; this is buggy
and causes tests to fail.
--- a/setup.py+++ b/setup.py@@ -179,6 +179,7 @@ ext_modules = ext_modules,
cmdclass = {'install_lib': MyInstallLib,
'build_py': MyBuildPy},
+ zip_safe = False, **kwargs
)