Remove unnecessary headers and set needed ones to be explicitely required

src/libaacs/mkb.c

@@ -2,13 +2,7 @@
 #include "config.h"
 #endif
 
-#if HAVE_MALLOC_H
-#include <malloc.h>
-#endif
-
-#if HAVE_STDLIB_H
 #include <stdlib.h>
-#endif
 
 #include "mkb.h"
 #include "../file/file.h"

src/libaacs/mkb.h

@@ -3,8 +3,6 @@
 #define MKB_H_
 
 #include <stdint.h>
-#include <unistd.h>
-#include <stdio.h>
 
 typedef struct mkb MKB;
 struct mkb {