(isc_mkipaddress): Changed struct sockaddr to SOCKADDR_STORAGE.
(isc_getladdress): Ditto.  Cast argument of getsockname from
	SOCKADDR_STORAGE* to struct sockaddr*.
(isc_getraddress): Ditto (but for getpeername instead of getsockname).
(isc_getipnum): Handle IPv6.
(isc_gethostname): Ditto.
(isc_getportnum): Ditto.
(isc_getservice): Use isc_getportnum to simplify code.