All Python ports: Address abort() for ctypes import on FreeBSD/ARM

The current FreeBSD/ARM __clear_cache() implementation does nothing #if
__i386__ || __x86_64__ #else abort();

cognet@ advises this is an issue for anything !Apple that is using the
libcompiler_rt provided by Clang on ARM, and requires upstreaming.

This is the root cause of abort() on import for the ctypes module in
Python, as they bundle libffi. [1]

This change patches the bundled libffi library in all Python ports, even
though it is a NOOP for the ports that use devel/libffi. These ports,
currently python31, will get the fix via ports/184517

A huge shout out to cognet@ who helped diagnose the issue and created
the patch to address it. Thank you!

PR:		ports/149167 [1]
PR:		ports/184517
Submitted by:	cognet [3]
Reviewed by:	cognet, eadler, milki, ak

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