remove libevent-internal.h

gevent/libevent-internal.h

-struct event_base {
-	const void *evsel;
-	void *evbase;
-	int event_count;		/* counts number of total events */
-	int event_count_active;	/* counts number of active events */
-
-	int event_gotterm;		/* Set to terminate loop */
-	int event_break;		/* Set to terminate loop immediately */
-
-	/* active event management */
-	struct event_list **activequeues;
-	int nactivequeues;
-};
-
-