[issue23085] update internal libffi copy to 3.2.1

[Zachary Ware]

Changes by Zachary Ware <zachary.ware at gmail.com>:


----------
versions: +Python 3.6 -Python 3.4

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23085>
_______________________________________