Disable cythonizing screen.py for Python 3. #120
Disable cythonizing screen.py for Python 3. #120

The experimental GUI is only supported for Python 2,
so cythonizing screen.py doesn't make sense on Python 3.

timeyyy/python-client,brcolow/python-client,starcraftman/python-client,Shougo/python-client,traverseda/python-client,0x90sled/python-client,traverseda/python-client,meitham/python-client,Shougo/python-client,zchee/python-client,zchee/python-client,brcolow/python-client,starcraftman/python-client,neovim/python-client,timeyyy/python-client,bfredl/python-client,0x90sled/python-client,neovim/python-client,bfredl/python-client,meitham/python-client