[issue28491] Remove bundled libffi for OSX

[Chi Hsuan Yen]

Chi Hsuan Yen added the comment:

Update: my pull request at https://github.com/libffi/libffi/pull/288 is merged. Future libffi releases don't need pkg-config anymore. However, I guess the system copy won't be updated in near future.

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<http://bugs.python.org/issue28491>
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