Complete support for DNS rewrite in OpenVMS. b=219487, r=wtc

build/unix/vms/mozilla.com

@@ -91,6 +91,9 @@ $    define /user VMS_NULL_DL_NAME 'ipc_shr'
 $ else
 $    define /user VMS_NULL_DL_NAME SYS$SHARE:TCPIP$IPC_SHR.EXE
 $ endif
+$ define /user GETADDRINFO     TCPIP$GETADDRINFO
+$ define /user FREEADDRINFO    TCPIP$FREEADDRINFO
+$ define /user GETNAMEINFO     TCPIP$GETNAMEINFO
 $ define /user GETIPNODEBYNAME TCPIP$GETIPNODEBYNAME
 $ define /user GETIPNODEBYADDR TCPIP$GETIPNODEBYADDR
 $ define /user FREEHOSTENT     TCPIP$FREEHOSTENT