appropriate type.
(address_info2sockaddr): Added argument for returning an
appropriate socket.
(address_info2sockaddr) [WITH_IPV6]: Pass on argument to choose_address.
(address_info2sockaddr) [!WITH_IPV6]: Create socket.
(io_connect): Added socket argument.
(io_listen): Likewise.
(io_listen_local): Updated for the io_listen change.
(io_connect_local): Updated for the io_connect change.

Rev: src/io.h:1.75.2.2