fix compiler warnings

* src/utils.h: Include <stdlib.h>
* src/recur.c: Include "exits.h"

src/recur.c

@@ -50,6 +50,7 @@ as that of the covered work.  */
 #include "html-url.h"
 #include "css-url.h"
 #include "spider.h"
+#include "exits.h"
 
 /* Functions for maintaining the URL queue.  */
 

src/utils.h

@@ -32,6 +32,8 @@ as that of the covered work.  */
 #ifndef UTILS_H
 #define UTILS_H
 
+# include <stdlib.h>
+
 /* Constant is using when we don`t know attempted size exactly */
 #define UNKNOWN_ATTEMPTED_SIZE -3