Flaky detection of compiler vendor

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-12-03.16:40:39.489>
labels = ['3.8', 'build', '3.7', '3.9']
title = 'Flaky detection of compiler vendor'
updated_at = <Date 2019-12-06.22:18:24.035>
user = 'https://bugs.python.org/jmaargh'

bugs.python.org fields:

activity = <Date 2019-12-06.22:18:24.035>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2019-12-03.16:40:39.489>
creator = 'jmaargh'
dependencies = []
files = []
hgrepos = []
issue_num = 38961
keywords = []
message_count = 1.0
messages = ['357755']
nosy_count = 1.0
nosy_names = ['jmaargh']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue38961'
versions = ['Python 2.7', 'Python 3.7', 'Python 3.8', 'Python 3.9']