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721ed1f466
Do not attach to the child before it was successfully initialized, or we
would need more sophisticated cleanup on child initialization failure,
like suppressing SIGCHILD delivery with multiple threads ("waitproc")
involved.
Improves "Cygwin: fork: Remember child not before success.",
commit f03ea8e1c57bd5cea83f6cd47fa02870bdfeb1c5, which leads to fork
problems if cygserver is running:
https://cygwin.com/ml/cygwin-patches/2019-q2/msg00155.html
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