GitLab

	All callers changed.  Turn off echoing if END_TIME is non-NULL.
	(kbd_buffer_get_event): New arg END_TIME.

	* lread.c (read_filtered_event): New arg SECONDS to wait until.
	(Fread_char, Fread_event, Fread_char_exclusive): New arg SECONDS.

	* lisp.h: Update read-char, read-event, and read_filtered_event
	prototypes.

	* keyboard.h: Include systime.h.  Update read_char prototype.