[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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keywords: +patch
pull_requests: +8703
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34663>
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