don't crash when there's a SMS game with pending messages

xwords4/android/XWords4/src/org/eehouse/android/xw4/GameUtils.java

@@ -1064,6 +1064,14 @@ public class GameUtils {
                 }
                 return true;
             }
+
+            public int transportSend( byte[] buf, final CommsAddrRec addr, int gameID )
+            {
+                DbgUtils.logf( "ResendTask.MsgSink.transportSend: dropping message "
+                               + "of len %d on addr type %s", buf.length, 
+                               addr.conType.toString() );
+                return -1;
+            }
         }
     }