Bug fix. include stdlib instead of stdio

hasumikin · hasumikin · commit ad35faabe66b · 2023-02-16T20:28:22.000+09:00
diff --git a/src/machine.c b/src/machine.c
@@ -1,6 +1,6 @@
 #include <mrubyc.h>
 
-#include <stdio.h>
+#include <stdlib.h>
 #include "pico/bootrom.h"
 #include "bsp/board.h"
 
