Fix bug #12829 with aborts on MS-Windows when several child processes die.
nt/inc/sys/wait.h: New file, with prototype of waitpid and definitions of macros it needs. nt/inc/ms-w32.h (wait): Don't define, 'wait' is not used anymore. (sys_wait): Remove prototype. nt/config.nt (HAVE_SYS_WAIT_H): Define to 1. src/w32proc.c (create_child): Don't clip the PID of the child process to fit into an Emacs integer, as this is no longer a restriction. (waitpid): Rename from sys_wait. Emulate a Posix 'waitpid' by reaping only the process specified by PID argument, if that is positive. Use PID instead of dead_child to know which process to reap. Wait for the child to die only if WNOHANG is not in OPTIONS. (sys_select): Don't set dead_child. src/sysdep.c (wait_for_termination_1): Remove the WINDOWSNT portion, as it is no longer needed. src/process.c (waitpid, WUNTRACED) [!WNOHANG]: Remove definitions, no longer needed. (record_child_status_change): Remove the setting of record_at_most_one_child for the !WNOHANG case.
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