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	replay_sequence_new_buffer label; replay_sequence should be here
	instead.

	* keyboard.c (Vlast_event_frame): Arrange for this to exist iff
	MULTI_FRAME is defined.
	[not MULTI_FRAME] (syms_of_keyboard): Don't DEFVAR Vlast_event_frame.
	[not MULTI_FRAME] (read_char): Don't try to set Vlast_event_frame.
	[not MULTI_FRAME] (kbd_buffer_store_event): Don't try to set
	Vlast_event_frame for quit characters.
	[not MULTI_FRAME] (kbd_buffer_get_event): Don't try to generate
	switch-frame events.