[GCC-XML]Get rid of compiler created construcors

[Brad King]

On Mon, 13 Oct 2003, Paul Ross wrote:

> This also might be useful for variables as well and so identify
> compiler generated vtables. I seems to work with the addition of:
>
>    xml_print_artificial_attribute (xdi, vd);
>
> To xml_output_var_decl() in xml.c

Great idea.  I've just committed the change.  Thanks.

-Brad