[Bug 250322] lang/python3{6,7,8,9}: Backport close_range patches

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250322

--- Comment #3 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: kevans
Date: Wed Oct 14 18:09:43 UTC 2020
New revision: 552351
URL: https://svnweb.freebsd.org/changeset/ports/552351

Log:
  lang/python3{6,7,8,9}: Backport close_range patches

  Worked out over BPO-40422 and BPO-40423, this is the culmination of months
  of work to coordinate with Linux and get close_range(2) added to FreeBSD,
  then the usage accepted into CPython. It has landed for Python 3.10 and here
  I've backported it locally to all the supported Python 3 versions we have.

  Note that this does include and supercede our previous closefrom(2) patches.
  There was a lot of intersection between the work done, so this patch against
  the ports tree does remove those patches from each of the ports in favor of
  this patch. All the patches involved have been accepted and merged upstream.

  This patch will bring a performance boost in some more situations on 12.2
  and 13.0, as close_range exists there.

  There is one additional patch sitting in an upstream PR that shuffles the
  _Py_closerange implementation into a different file -- this is not important
  for the backport, and the absence of that patch here will not realistically
  cause any issues.

  PR:           250322
  Approved by:  lwhsu (python)

Changes:
  head/lang/python36/Makefile
  head/lang/python36/files/patch-Modules___posixsubprocess.c
  head/lang/python36/files/patch-Modules_posixmodule.c
  head/lang/python36/files/patch-issue40422_issue40423
  head/lang/python37/Makefile
  head/lang/python37/files/patch-Modules___posixsubprocess.c
  head/lang/python37/files/patch-Modules_posixmodule.c
  head/lang/python37/files/patch-issue40422_issue40423
  head/lang/python38/Makefile
  head/lang/python38/files/patch-Modules___posixsubprocess.c
  head/lang/python38/files/patch-Modules_posixmodule.c
  head/lang/python38/files/patch-issue40422_issue40423
  head/lang/python39/Makefile
  head/lang/python39/files/patch-issue40422_issue40423

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