9083 replace regex implementation with tre

*** 66,71 ****
--- 66,73 ----
  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_ */