Workaround for changes in 3.4 CPython

Build is broken in Python 3.4, because someone had an idea to enforce ISO C90 standard on all C source code. Without manually disabling them compilation breaks pretty easily on the beginning of utf8.c (`int i` in bad place...).
Update waf. Fixes #39.
Merge branch 'patch-1' of https://github.com/kropelka/termbox