bug#10258: compilation-error-regexp-alist just assumes columns not characters

[Stefan Monnier]

> (setq compilation-error-screen-columns t);default, set once more for good 
> luck.
> (make-variable-buffer-local 'compilation-error-screen-columns)
> (add-hook 'xquery-mode-hook
>         (function (lambda ()
>                     (setq compilation-error-screen-columns nil))))

Better not call make-variable-buffer-local except on variables you have
defined yourself (e.g. in this case only do it in compile.el).
I.e. use

 (add-hook 'xquery-mode-hook
          (lambda ()
            (set (make-local-variable 'compilation-error-screen-columns) nil)))


-- Stefan