configure fails to detect fchdir() using CFLAGS="-Werror -Wall"

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-10-10.17:05:50.570>
labels = ['type-feature', '3.7', 'build']
title = 'configure fails to detect fchdir() using CFLAGS="-Werror -Wall"'
updated_at = <Date 2017-10-11.09:30:09.481>
user = 'https://bugs.python.org/dilyanpalauzov'

bugs.python.org fields:

activity = <Date 2017-10-11.09:30:09.481>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2017-10-10.17:05:50.570>
creator = 'dilyan.palauzov'
dependencies = []
files = []
hgrepos = []
issue_num = 31748
keywords = ['patch']
message_count = 9.0
messages = ['304059', '304073', '304075', '304077', '304080', '304081', '304082', '304121', '304123']
nosy_count = 2.0
nosy_names = ['vstinner', 'dilyan.palauzov']
pr_nums = ['3949']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31748'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7']