Please add cffi to the official LEDE package repos

Erco Col

Hello. I'm trying to install pymysql package but it displays the next error:

Collecting cffi
Using cached https://files.pythonhosted.org/packages/e7/a7/4cd50e57cc6f436f1cc3a7e8fa700ff9b8b4d471620629074913e3735fb2/cffi-1.11.5.tar.gz
Complete output from command python setup.py egg_info:

    No working compiler found, or bogus compiler options passed to
    the compiler from Python's standard "distutils" module.  See
    the error messages above.  Likely, the problem is not related
    to CFFI but generic to the setup.py of any Python package that
    tries to compile C code.  (Hints: on OS/X 10.8, for errors about
    -mno-fused-madd see http://stackoverflow.com/questions/22313407/
    Otherwise, see https://wiki.python.org/moin/CompLangPython or
    the IRC channel #python on irc.freenode.net.)

Being able to install pymysql is highly important for us in order to use omega2 by Onion in our projects.

Thanks.