[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I suggest to name the parameter "use_vfork", or maybe even "vfork".

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nosy: +vstinner

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