9083 replace regex implementation with tre

@@ -66,6 +66,8 @@
 size_t  _collate_wxfrm(const struct lc_collate *, const wchar_t *,
     wchar_t *, size_t);
 size_t  _collate_sxfrm(const wchar_t *, char *, size_t, locale_t);
 int     _collate_range_cmp(wchar_t, wchar_t, locale_t);
 
+int     __collate_equiv_value(locale_t, const wchar_t *, size_t);
+
 #endif /* !_COLLATE_H_ */