Fixed missing includes for multiboot2 files

src/x86/multiboot2.c

@@ -1,4 +1,6 @@
 #include "multiboot2.h"
+#include "stdio.h"
+#include "string.h"
 
 void *read_multiboot_table(struct boot_info_t *boot_info, void *table)
 {

src/x86/multiboot2.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "memorymap.h"
+#include "module.h"
 #include <stddef.h>
 #include <stdint.h>