make router version member optional on serialization

llarp/dht/messages/gotrouter.cpp

@@ -124,7 +124,7 @@ namespace llarp
       {
         if(not dht.GetRouter()->rcLookupHandler().CheckRC(rc))
           return false;
-        if(txid == 0 and R.size() == 1)
+        if(txid == 0 and foundRCs.size() == 1)
         {
           // flood as needed
           dht.FloodRCLater(From, rc);

llarp/dht/messages/gotrouter.hpp

@@ -43,7 +43,8 @@ namespace llarp
       }
 
       /// gossip message
-      GotRouterMessage(const RouterContact rc) : IMessage({}), R({rc}), txid(0)
+      GotRouterMessage(const RouterContact rc)
+          : IMessage({}), foundRCs({rc}), txid(0)
       {
         version = LLARP_PROTO_VERSION;
       }