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 src/w32proc.c (new_child, delete_child, find_child_pid): For a
 subprocess, consider its slot being in use as long as its process
 handle (procinfo.hProcess) is not NULL.  This avoids reusing the
 slot when a new process is started immediately after killing
 another one, without waiting enough time for the first process to
 be reaped and resources allocated for it be orderly freed.
 Suggested by Fabrice Popineau <fabrice.popineau@supelec.fr>.