[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[Ronald Oussoren]

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

Good question. A comment on <https://stackoverflow.com/questions/2731531/faster-forking-of-large-processes-on-linux> says that glibc already uses vfork where appropriate, explicitly using the flag may not be necessary. 

Note that I haven't verified if the comment is correct.

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