Possibly fix bug #13086 with losing track of subprocesses on MS-Windows.
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 <email@example.com>.
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