use -wrap for exit

sysmodules/pxi/source/main.c

@@ -107,7 +107,7 @@ void __libc_init_array(void);
 void __ctru_exit(int rc) { (void)rc; } // needed to avoid linking error
 
 // this is called after main exits
-void exit(int rc)
+void __wrap_exit(int rc)
 {
     (void)rc;