[issue23085] update internal libffi copy to 3.2.1

[Berker Peksag]

Berker Peksag added the comment:

> which Berker says have been fixed in upstream libffi: https://bugs.python.org/issue25077#msg266068

Correct, here is the actual commit: https://github.com/libffi/libffi/commit/4a677a425c18eda4bc5357b2485da57f133f908d

I have also sent a patch to upstream libffi for https://github.com/python/cpython/blob/master/Modules/_ctypes/libffi.diff#L161: https://github.com/libffi/libffi/commit/1e82e1cda43dacd8b6ab2d9ac4db33523d86f5dc

But both of them will be released in libffi 4.0.

Note that the current master branch of libffi doesn't seem to be compiled with a C89 compiler (see https://github.com/libffi/libffi/issues/218 for details). See also https://mail.python.org/pipermail/python-dev/2016-June/144816.html for discussion about C99 support in CPython.

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nosy: +berker.peksag

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