Remove reliance on system stdint.h header

arch/aarch64.c

@@ -1,5 +1,5 @@
 #if defined(__aarch64__)
-#include <stdint.h>
+#include "../int.h"
 
 void exit(int8_t status){
   asm ( "mov x0, %0\n"        // Move the exit status into register x0

arch/mips.c

@@ -1,5 +1,5 @@
 #if defined(__mips__)
-#include <stdint.h>
+#include "../int.h"
 
 void exit(int8_t status){
   asm ( 

arch/x86_64.c

@@ -1,5 +1,5 @@
-#include <stdint.h>
 #if defined(__x86_64__)
+#include "../int.h"
 
 #define SYS_EXIT 60
 void exit(int8_t status) {