conversion of service names to port numbers. This way, all that's
needed for SRV-records is proper support in getaddrinfo.

* src/lshd.c (parse_interface): Changed interface to use plain
NUL-terminated strings.
(main_argp_parser): Updated for new io_resolv_address interface.

Rev: src/io.c:1.188
Rev: src/io.h:1.102
Rev: src/lshd.c:1.151