Minor header inclusion tweak for new usage of stat()

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@71521 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_agi.c

@@ -44,6 +44,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/wait.h>
+#include <sys/stat.h>
 
 #include "asterisk/file.h"
 #include "asterisk/logger.h"