Remove bundled libffi for OSX

zware

BPO	28491
Nosy	@ronaldoussoren, @ned-deily, @bitdancer, @zware, @koobs, @matrixise, @yan12125
Superseder	bpo-41100: Support macOS 11 and Apple Silicon Macs
Files	remove_libffi_osx.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-11-08.12:07:24.418>
created_at = <Date 2016-10-20.18:40:27.517>
labels = ['OS-mac', 'ctypes', 'type-feature', '3.7', 'build']
title = 'Remove bundled libffi for OSX'
updated_at = <Date 2020-11-08.12:07:24.417>
user = 'https://github.com/zware'

bugs.python.org fields:

activity = <Date 2020-11-08.12:07:24.417>
actor = 'ronaldoussoren'
assignee = 'none'
closed = True
closed_date = <Date 2020-11-08.12:07:24.418>
closer = 'ronaldoussoren'
components = ['Build', 'macOS', 'ctypes']
creation = <Date 2016-10-20.18:40:27.517>
creator = 'zach.ware'
dependencies = []
files = ['45157']
hgrepos = []
issue_num = 28491
keywords = ['patch']
message_count = 10.0
messages = ['279063', '279064', '279065', '279067', '279069', '279122', '279123', '289707', '379419', '380548']
nosy_count = 7.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'r.david.murray', 'zach.ware', 'koobs', 'matrixise', 'yan12125']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = '41100'
type = 'enhancement'
url = 'https://bugs.python.org/issue28491'
versions = ['Python 3.7']