Adjust path to core's api/

Author: SergeAgeyev

ArduinoCore-Linux/cores/arduino/Ethernet.h

@@ -6,7 +6,7 @@
 #include <unistd.h>     // for close
 
 #include "ArduinoLogger.h"
-#include "Client.h"
+#include <api/Client.h>
 #include <api/Common.h>
 #include <api/IPAddress.h>
 #include "RingBufferExt.h"