sysconfig --generate-posix-vars creates wrong file when cross compiling

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-11-27.12:05:59.850>
labels = ['type-bug', 'build', '3.11']
title = 'sysconfig --generate-posix-vars creates wrong file when cross compiling'
updated_at = <Date 2021-11-27.19:03:41.450>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2021-11-27.19:03:41.450>
actor = 'christian.heimes'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build', 'Cross-Build']
creation = <Date 2021-11-27.12:05:59.850>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 45909
keywords = []
message_count = 2.0
messages = ['407141', '407163']
nosy_count = 3.0
nosy_names = ['christian.heimes', 'Alex.Willmer', 'ethan smith']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45909'
versions = ['Python 3.11']