(any_kboard_state): Renamed from unlock_kboard.
Define it unconditionally, but it's a no-op unless MULTI_KBOARD. (single_kboard_state): New function. (push_frame_kboard, pop_frame_kboard): New functions. (single_kboard): Renamed from kboard_locked. (unlock_kboard): Do nothing with Vunread_command_events. (read_char): Clean up logic for reading from KBOARD queues. (kbd_buffer_get_event): Set copy by assignment, not init.
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