`skip-chars-forward' is broken in unibyte buffers

[Jesper Harder]

Hi!

I think the recent change in syntax.c broke `skip-chars-forward' in
unibyte buffers.  Compare these results:

(let (default-enable-multibyte-characters)
  (with-temp-buffer
    (insert "sp=F8rgsm")
    (goto-char (point-min))
    (skip-chars-forward "^=")))
=> 0

(with-temp-buffer
  (insert "sp=F8rgsm")
  (goto-char (point-min))
  (skip-chars-forward "^="))
=> 2


In GNU Emacs 21.3.50.58 (i686-pc-linux-gnu)
 of 2003-04-24 on defun.localdomain
configured using `configure '--with-gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.iso88591
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t