os.chroot is not enabled on HP-UX builds

[inorton]

BPO	39619
Nosy	@benjaminp, @miss-islington, @inorton
PRs	bpo-39619 Fix os.chroot on HP-UX 11.31 #18495 [3.8] closes bpo-39619 Fix os.chroot on HP-UX 11.31 (GH-18495) #18509

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-02-14.03:09:17.614>
created_at = <Date 2020-02-12.22:33:53.015>
labels = ['interpreter-core', '3.8', 'type-feature', '3.7', '3.9']
title = 'os.chroot is not enabled on HP-UX builds'
updated_at = <Date 2020-02-14.03:27:31.487>
user = 'https://github.com/inorton'

bugs.python.org fields:

activity = <Date 2020-02-14.03:27:31.487>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2020-02-14.03:09:17.614>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2020-02-12.22:33:53.015>
creator = 'Ian Norton'
dependencies = []
files = []
hgrepos = []
issue_num = 39619
keywords = ['patch']
message_count = 3.0
messages = ['361921', '361981', '361983']
nosy_count = 3.0
nosy_names = ['benjamin.peterson', 'miss-islington', 'Ian Norton']
pr_nums = ['18495', '18509']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39619'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[inorton]

When building on HP-UX using:

The configure stage fails to detect chroot(). This is due to setting _XOPEN_SOURCE to a value higher than 500.

The fix for this is to not set _XOPEN_SOURCE when configuring for HP-UX

[benjaminp]

New changeset a9edf44 by Ian Norton in branch 'master':
closes bpo-39619 Fix os.chroot on HP-UX 11.31 (GH-18495)
a9edf44

[miss-islington]

New changeset 28fc1ba by Miss Islington (bot) in branch '3.8':
closes bpo-39619 Fix os.chroot on HP-UX 11.31 (GH-18495)
28fc1ba