gdb/

gdb/
	* event-loop.c: Include "queue.h".
	(gdb_event_p): New typedef.
	(DECLARE_QUEUE_P): Use.
	(DEFINE_QUEUE_P): Use.
	(async_queue_event): Remove.
	(gdb_event_xfree): New.
	(initialize_event_loop): New.
	(process_event): Use QUEUE macros.
	(event_queue): Remove.
	(gdb_wait_for_event): Caller update.
	(check_async_event_handlers): Likewise.
	(poll_timers): Likewise.
	* event-loop.h (initialize_event_loop): Declare.
	* event-loop.c (gdb_event_xfree): New.
	* top.c (gdb_init): Call initialize_event_loop.