Modify preemptive redisplay to be based on periodic checks for input.
(PERIODIC_PREEMPTION_CHECKING): Define to 1 iff EMACS_HAS_USECS. (Vredisplay_preemption_period): New variable. (syms_of_display): DEFVAR_LISP and initialize it. (preemption_period, preemption_next_check): New variables. (update_frame, update_single_window): Initialize them based on Vredisplay_preemption_period if !force_p. (update_window, update_frame_1): Use them to determine when to check for input.
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