[RFA] use filename_completer for add_setshow_optional_filename_cmd

[Eli Zaretskii]

> From: "Pierre Muller" <muller@ics.u-strasbg.fr>
> Cc: <gdb-patches@sourceware.org>
> Date: Fri, 4 Jul 2008 16:55:27 +0200
> 
> 
> What about this for NEWS:
> 
> diff -u -p -r1.277 NEWS
> --- gdb/NEWS	11 Jun 2008 12:56:36 -0000	1.277
> +++ gdb/NEWS	4 Jul 2008 11:35:19 -0000
> @@ -3,6 +3,9 @@
>  
>  *** Changes since GDB 6.8
>  
> +* Commands `set debug-file-directory', `set solib-search-path' and `set
> args'
> +now complete on file names.
> +

Okay.