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closes bpo-39619 Fix os.chroot on HP-UX 11.31 (GH-18495)

Setting `-D_XOPEN_SOURCE=700` on HP-UX causes system functions such as chroot to be undefined.  This change stops `_XOPEN_SOURCE` begin set on HP-UX

Co-authored-by: Benjamin Peterson <benjamin@python.org>
I
Ian Norton committed
a9edf44a2de9b23a1690b36cdfeed7b41ab763bd
Parent: f632736
Committed by GitHub <noreply@github.com> on 2/14/2020, 3:09:11 AM