(gen_help_event): Add parameter SIZE.
(kbd_buffer_events_waiting): Slightly rewritten. (clear_event): New function. (kbd_buffer_get_event): Use it, and clear the input_events of HELP_EVENTs. (init_keyboard): Remove duplicate creation of kbd_buffer_gcpro and don't fill the newly created array with nils. (toplevel): Convert some old-style function forward declarations to prototypes.
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