(find_defun_start): Use `syntax_table' instead of

(find_defun_start): Use `syntax_table' instead of
`mirror_syntax_table' in XEmacs UTF-2000.
(Fset_syntax_table): Don't use `mirror_syntax_table' in XEmacs
UTF-2000.
(Fchar_syntax): Use `syntax_table' instead of `mirror_table' in XEmacs
UTF-2000.
(Fmatching_paren): Likewise.
(scan_words): Use `syntax_table' instead of `mirror_syntax_table' in
XEmacs UTF-2000.
(find_start_of_comment): Likewise.
(find_end_of_comment): Likewise.
(Fforward_comment): Likewise.
(scan_lists): Likewise.
(char_quoted): Likewise.
(Fbackward_prefix_chars): Likewise.
(scan_sexps_forward): Likewise.
(update_just_this_syntax_table): Deleted in XEmacs UTF-2000.
(update_syntax_table): Likewise.