Fix Fortran bootstrap failure in interface.c

[Paul Thomas]

Gerald,
>
> The patch below already proceeded farther into the bootstrap than current
> SVN HEAD on i586-suse-linux, so I went ahead and committed it.
>   
Many thanks. I did the final check with --disable-bootstrap and missed 
the warning.

Paul
> Gerald
>
> 2006-12-27  Gerald Pfeifer  <gerald@pfeifer.com>
>
> 	* interface.c (compare_actual_formal): Remove unused variable
> 	gsym.
>
> Index: interface.c
> ===================================================================
> --- interface.c	(revision 120218)
> +++ interface.c	(working copy)
> @@ -1270,7 +1270,6 @@
>  {
>    gfc_actual_arglist **new, *a, *actual, temp;
>    gfc_formal_arglist *f;
> -  gfc_gsymbol *gsym;
>    int i, n, na;
>    bool rank_check;
>
>
>