more transparant support for IPv6 name resolving

lib/urldata.h

@@ -26,6 +26,7 @@
 /* This file is for lib internal stuff */
 
 #include "setup.h"
+#include "hostip.h"
 
 #define PORT_FTP 21
 #define PORT_TELNET 23
@@ -223,12 +224,12 @@ struct connectdata {
 #define PROT_FILE    (1<<8)
 #define PROT_FTPS    (1<<9)
 
+  Curl_addrinfo *hp; /* IP-protocol independent host info pointer list */
+  char *hostent_buf; /* pointer to allocated memory for name info */
+
 #ifdef ENABLE_IPV6
-  struct addrinfo *hp; /* host info pointer list */
   struct addrinfo *ai; /* the particular host we use */
 #else
-  char *hostent_buf; /* pointer to allocated memory for name info */
-  struct hostent *hp;
   struct sockaddr_in serv_addr;
 #endif
   char protostr[64];  /* store the protocol string in this buffer */