Adjust path to core's api/

Author: SergeAgeyev

ArduinoCore-Linux/cores/arduino/EthernetServer.h

@@ -4,7 +4,7 @@
 #include <unistd.h>
 
 #include "Ethernet.h"
-#include "Server.h"
+#include <api/Server.h>
 #include "SignalHandler.h"
 
 namespace arduino {