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	first time the user quits, or SIGKILL if the user quits again.
	#include "syssignal.h".
	(call_process_kill): New function.
	(call_process_cleanup): Send SIGINT to the subprocess, and then
	arrange to call call_process_kill if the user quits while we wait
	for it to terminate.
	(Fcall_process, Fcall_process_region): Doc fix.