[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

If vfork() is used ob FreeBSD, wouldn't be better to make use_vfork=True the default on FreeBSD and raise an error on use_vfork=False?

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue34663>
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