missing header file

git-svn-id: svn://bind10.isc.org/svn/bind10/branches/parkinglot@540 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/dns/cpp/rrttl.h

@@ -17,6 +17,8 @@
 #ifndef __RRTTL_H
 #define __RRTTL_H 1
 
+#include <stdint.h>
+
 #include "exceptions.h"
 
 namespace isc {