Merge pull request #1615 from Diapolo/net_noExtIp_IPv6only

do not use external IPv4 discovery, when -onlynet="IPv6"

src/net.cpp

@@ -1878,6 +1878,8 @@ void static Discover()
     }
 #endif
 
+    // Don't use external IPv4 discovery, when -onlynet="IPv6"
+    if (!IsLimited(NET_IPV4))
         CreateThread(ThreadGetMyExternalIP, NULL);
 }