* keyboard.c (Fexecute_mouse_event): dyked-out function deleted.

* keyboard.c (Fexecute_mouse_event): dyked-out function deleted.
	We're not going to use this mouse interface.
	(Vmouse_window, Vmouse_event, Vmouse_event_function,
	Vmouse_left_hook, Vmap_frame_hook, Vunmap_frame_hook,
	Vmouse_motion_handler): Variables deleted; they were to be used by
	Fexecute_mouse_event.
	(syms_of_keyboard): Same.
	(command_loop_1): Remove dyked-out code to support
	Fexecute_mouse_event.
	(read_char): Same.

	* keyboard.c (Vlast_event_frame): Don't define this window if
	MULTI_FRAME is not #defined.
	(syms_of_keyboard): Same.
	(kbd_buffer_store_event): Don't try to work with Vlast_event_frame
	if MULTI_FRAME is not #defined.
	(kbd_buffer_get_event): Same.

	* keyboard.c (Fdiscard_input): Removed dyked-out code from when
	unread_command_char's quiescent value was -1, not nil.