* inf-ttrace.c: Include <signal.h>

	* inf-ttrace.c: Include <signal.h>
	(inf_ttrace_delete_dead_threads_callback): New.
	(inf_ttrace_resume_lwp): New.
	(inf_ttrace_resume_callback, inf_ttrace_resume): Rewrite.  Don't
	delete dying threads until they are really dead.
	(inf_ttrace_wait): After stopping the whole process, delete any
	dying thread that is really dead by now.
	(inf_ttrace_thread_alive): Return 1.
	(inf_ttrace_extra_thread_info): New.
	(inf_ttrace_target): Register inf_ttrace_extra_thread_info.