Merge remote-tracking branch 'github/21_fast_syscalls'

diff --cc bufferevent_sock.c
Simple merge

diff --cc configure.in
Simple merge

diff --cc epoll.c
Simple merge

diff --cc evdns.c
Simple merge

diff --cc event.c
Simple merge

diff --cc evutil.c
Simple merge

diff --cc http.c
Simple merge

diff --cc listener.c
Simple merge

diff --cc signal.c
Simple merge

diff --cc util-internal.h
Simple merge