Attached is a patch for 'curl-7.12-hostip2' adding a threaded
getaddrinfo(). There's no Curl_ip2addr() for 'struct addrinfo',
so all names are passed to getaddrinfo().

The Curl_inet_ntop() in dump_addrinfo() will probably go away,
unless we add inet_ntop.* (attached).

Included some preliminaries for IDNA too.

--gv