[issue28491] Remove bundled libffi for OSX

[Stéphane Wirtel]

Stéphane Wirtel added the comment:

On my OSX with El Capitan and HomeBrew

Configuration:

env PKG_CONFIG_PATH=/usr/local/opt/libffi/lib/pkgconfig ./configure --prefix=$PWD-build

Compilation:

make

Tests:

./python.exe -c 'import ctypes'

Results:
* No SIGSEGV
* Add a new dependency to pkg-config :/

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