-arch <arch> detection in _osx_support generates false positives

GitHub fields:

assignee = 'https://github.com/ned-deily'
closed_at = None
created_at = <Date 2022-03-29.17:35:29.198>
labels = ['OS-mac', 'build', '3.9', '3.10', '3.11']
title = '-arch <arch> detection in _osx_support generates false positives'
updated_at = <Date 2022-03-29.21:13:55.846>
user = 'https://github.com/isuruf'

bugs.python.org fields:

activity = <Date 2022-03-29.21:13:55.846>
actor = 'dom1310df'
assignee = 'ned.deily'
closed = False
closed_date = None
closer = None
components = ['Build', 'macOS']
creation = <Date 2022-03-29.17:35:29.198>
creator = 'isuruf'
dependencies = []
files = []
hgrepos = []
issue_num = 47154
keywords = ['patch']
message_count = 2.0
messages = ['416278', '416280']
nosy_count = 4.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'isuruf', 'dom1310df']
pr_nums = ['32178']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue47154'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']