Python configure fails to detect tzname on platforms that have it.

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-09-12.19:33:55.115>
labels = ['type-bug', '3.7']
title = 'Python configure fails to detect tzname on platforms that have it.'
updated_at = <Date 2019-01-04.23:50:18.162>
user = 'https://github.com/abalkin'

bugs.python.org fields:

activity = <Date 2019-01-04.23:50:18.162>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2016-09-12.19:33:55.115>
creator = 'belopolsky'
dependencies = []
files = []
hgrepos = []
issue_num = 28108
keywords = []
message_count = 9.0
messages = ['276098', '276111', '276112', '276117', '276121', '276122', '276123', '332394', '333025']
nosy_count = 4.0
nosy_names = ['lemburg', 'belopolsky', 'vstinner', 'izbyshev']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28108'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']