[issue17873] _ctypes/libffi missing bits for aarch64 support

[Christian Heimes]

Changes by Christian Heimes <lists at cheimes.de>:


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nosy: +christian.heimes, ronaldoussoren
stage:  -> patch review
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17873>
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