Fix compiler warning arduino-1.6.9/hardware/tools/avr/avr/include/avr/delay.h:36:2: warning: #warning "This file has been moved to <util/delay.h>." [-Wcpp]

Firmware/lcd.cpp

@@ -4,7 +4,7 @@
 #include <stdio.h>
 #include <stdarg.h>
 #include <avr/pgmspace.h>
-#include <avr/delay.h>
+#include <util/delay.h>
 #include "Timer.h"
 
 #include "Configuration.h"

Firmware/swi2c.c

@@ -1,7 +1,7 @@
 //swi2c.c
 #include "swi2c.h"
 #include <avr/io.h>
-#include <avr/delay.h>
+#include <util/delay.h>
 #include <avr/pgmspace.h>
 #include "Configuration_prusa.h"
 #include "pins.h"