[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

@vstinner: another option is to ignore "use_vfork" on platforms that don't have POSIX_SPAWN_USEVFORK. Using vfork or not is primarily a optimisation, ignoring the flag should not result in different behaviour (other than speed).

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nosy: +ronaldoussoren

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