There is so many places where range comparation (using collate)

needed (much more than I think initially), so I forced to add
new user-visible non-standard function to libc.

include/locale.h

@@ -75,6 +75,7 @@ struct lconv {
 __BEGIN_DECLS
 struct lconv	*localeconv __P((void));
 char		*setlocale __P((int, const char *));
+int		collate_range_cmp __P((int, int));
 __END_DECLS
 
 #endif /* _LOCALE_H_ */