[issue17192] libffi-3.0.13 import

[koobs]

koobs added the comment:

Ready to confirm on buildbots when this lands

Also, libffi-3.0.13 is installed on my buildbots if you want to use -custom to have a play, I can be pinged anytime on IRC if I can be of any assistance. koobs @ #python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17192>
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