bug#2865: 23.0.92; tramp chmod on remote ftp fails

[Chong Yidong]

> > chmod files in remote server using tramp ftp fails without reporting
> > any error.  I've tried this tramp version with emacs 22 and works so
> > the problem may be in dired.el.  My elisp knowledge is poor I am not
> > able to give you more help, sorry.
>
> `dired-do-chmod' has changed its implementation; it uses
> `set-file-modes' now. Ange-ftp lacks an implementation of this function.
>
> I've added such an implementation; it shall work now. Could you, please,
> test?

Could you verify whether the bug is gone?  Thanks.