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	replaced by...
	(isearch-gnu-emacs-events): non-nil if should expect events in the
	style generated by GNU Emacs 19.  Set if set-frame-height is
	fboundp; this is true on any GNU Emacs 19, whether or not it was
	compiled with multiple frame support.
	(isearch-mode-map): Test isearch-gnu-emacs-events instead of
	isearch-frames-exist to see if we should bind switch-frame events.
	(isearch-update): Test isearch-gnu-emacs-events instead of
	isearch-frames-exist to see if unread-command-char's quiescent
	value is nil or -1.