python: add a C-wrapper based on python-cffi
python: add a C-wrapper based on python-cffi

CFFI provides the ability to use the same C wrapper
for python2, python3 and pypy.

vladimirvivien/go-cshared-examples,vladimirvivien/go-cshared-examples,vladimirvivien/go-cshared-examples,vladimirvivien/go-cshared-examples,vladimirvivien/go-cshared-examples,vladimirvivien/go-cshared-examples,vladimirvivien/go-cshared-examples,vladimirvivien/go-cshared-examples