squash a warning

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6196 65c4cc65-6c06-0410-ace0-fbb531ad65f3

funcs/func_callerid.c

@@ -26,6 +26,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/utils.h"
 #include "asterisk/app.h"
 #include "asterisk/options.h"
+#include "asterisk/callerid.h"
 
 static char *callerid_read(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len) 
 {