udp: don't make the socket non-blocking
udp: don't make the socket non-blocking

Since we're calling recv(MSG_DONTWAIT), we don't need to make the
socket non-blocking.


CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy