[issue27976] Deprecate building with bundled copy of libffi on non-Darwin POSIX platforms

[Berker Peksag]

Berker Peksag added the comment:

+1, thanks for working on this!

Two questions:

1. Should we check the system version of libffi and warn users (and probably use the bundled version for now) if it was older than 3.1?

2. I know this isn't directly a user-facing feature, but should we add a short note to Doc/whatsnew/3.6.rst? (we can probably mention that most of the Linux distributions already use --with-system-ffi.)

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stage: patch review -> commit review

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<http://bugs.python.org/issue27976>
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