[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[Serhiy Storchaka]

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

If glibc already uses vfork() if it is safe, I suppose that using vfork() in other cases is unsafe, and we shouldn't support this nonstandard option.

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