[issue38069] Make _posixsubprocess PEP-384 compatible

[Dino Viehland]

Change by Dino Viehland <dinoviehland at gmail.com>:


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keywords: +patch
pull_requests: +15433
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/15780

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38069>
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