[issue22176] update internal libffi copy to 3.1, introducing AArch64 and POWER ELF ABIv2

[Mark Lawrence]

Mark Lawrence added the comment:

Can this be closed as there are ongoing discussions about libffi, particularly with respect to bring it into the Windows external build system?  I've tried to find the relevant issue numbers but have failed, sorry :(

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nosy: +BreamoreBoy

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22176>
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