libevent: Globals

libevent 2.1.12 Event notification library

- bufferevent_data_cb : bufferevent.h
- bufferevent_event_cb : bufferevent.h
- bufferevent_filter_cb : bufferevent.h
- evbuffer_cb : buffer_compat.h
- evbuffer_cb_func : buffer.h
- evbuffer_file_segment_cleanup_cb : buffer.h
- evbuffer_ref_cleanup_cb : buffer.h
- evdns_callback_type : dns.h
- evdns_debug_log_fn_type : dns.h
- evdns_getaddrinfo_cb : dns.h
- evdns_request_callback_fn_type : dns.h
- event_base_foreach_event_cb : event.h
- event_callback_fn : event.h
- event_fatal_cb : event.h
- event_finalize_callback_fn : event.h
- event_log_cb : event.h