Add missing prerequisite include

src/include/stdlib.h

 #ifndef STDLIB_H
 #define STDLIB_H
 
+#include <stdint.h>
+
 extern unsigned long strtoul ( const char *p, char **endp, int base );
 extern void * realloc ( void *old_ptr, size_t new_size );
 extern void * malloc ( size_t size );