bpo-41100: ctypes fixes for arm64 Mac OS - #21249

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lawrence-danna-apple wants to merge 10 commits into

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lawrence-danna-apple:postback-ctypes-combined

lawrence-danna-apple commented Jul 1, 2020•
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Posted in response to this comment by Ronald #21242 (comment)

This PR would supersede these two, combining because the third commit depends on both

This has three commits:

ctypes: use the correct ABI for variadic functions
use system libffi for Mac OS 10.15 and up
setup.py: probe libffi for ffi_closure_alloc and ffi_prep_cif_var

The first two are from those previous PRs. The third makes setup.py probe for those functions by searching libffi's headers.

https://bugs.python.org/issue41100

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