[pypy-issue] Issue #2416: [CFFI] Idle prints warnings on PyPy3 (pypy/pypy)

[squeaky]

New issue 2416: [CFFI] Idle prints warnings on PyPy3
https://bitbucket.org/pypy/pypy/issues/2416/cffi-idle-prints-warnings-on-pypy3

squeaky:



```
pypy3.3-5.5-alpha-20161013-linux_x86_64-portable/bin/pypy -m idlelib.idle

Warning (from warnings module):
  File "<string>", line 3
UserWarning: implicit cast from 'char *' to 'unsigned short *' will be forbidden in the future (check that the types are as you expect; use an explicit ffi.cast() if they are correct)

Warning (from warnings module):
  File "<string>", line 3
UserWarning: implicit cast from 'char *' to 'unsigned short *' will be forbidden in the future (check that the types are as you expect; use an explicit ffi.cast() if they are correct)
>>> 
Warning (from warnings module):
  File "<string>", line 3
UserWarning: implicit cast from 'char * *' to 'char *' will be forbidden in the future (check that the types are as you expect; use an explicit ffi.cast() if they are correct)
```