bug report #530204 correctly identified that revision 1.52 broke ipv6

functionality and this change reverts this.

However, with this revert we bring back problems on (some/all?) non-IPv6
enabled Linux machines that have getaddrinfo().

lib/hostip.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___ 
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 2001, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2002, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * In order to be useful for every potential user, curl and libcurl are
  * dual-licensed under the MPL and the MIT/X-derivate licenses.
@@ -293,7 +293,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
   char sbuf[NI_MAXSERV];
 
   memset(&hints, 0, sizeof(hints));
-  hints.ai_family = PF_INET;
+  hints.ai_family = PF_UNSPEC;
   hints.ai_socktype = SOCK_STREAM;
   hints.ai_flags = AI_CANONNAME;
   snprintf(sbuf, sizeof(sbuf), "%d", port);