Keep trace of the list of addresses a name resolved to, and print out

how many there were if there were more than one.

Target.h

@@ -283,6 +283,11 @@ class Target {
   struct probespec traceroute_probespec;
   std::list <TracerouteHop> traceroute_hops;
 
+  /* If the address for this target came from a DNS lookup, the list of
+     resultant addresses (sometimes there are more than one). The address
+     actually used is always the first element in this list. */
+  std::list<struct sockaddr_storage> resolved_addrs;
+
 #ifndef NOLUA
   ScriptResults scriptResults;
 #endif