fix rp2040 too

src/mesh/eth/ethClient.cpp

@@ -68,9 +68,11 @@ static int32_t reconnectETH()
                 initApiServer();
             }
 #endif
+#if HAS_UDP_MULTICAST
             if (udpHandler && config.network.enabled_protocols & meshtastic_Config_NetworkConfig_ProtocolFlags_UDP_BROADCAST) {
                 udpHandler->start();
             }
+#endif
 
             ethStartupComplete = true;
         }

src/platform/nrf52/AsyncUDP.cpp

@@ -70,4 +70,4 @@ int32_t AsyncUDP::runOnce()
     return 5; // check every 5ms
 }
 
-#endif
+#endif // HAS_ETHERNET

src/platform/nrf52/AsyncUDP.h

@@ -58,6 +58,6 @@ inline bool isMulticast(const IPAddress &ip)
     return (ip[0] & 0xF0) == 0xE0;
 }
 
-#endif
+#endif // HAS_ETHERNET
 
 #endif // ASYNC_UDP_H