Change of binding details please

[Jeff Franks <jcfranks tpg com au>]

Hi,

The GFC C++ binding is no longer a stand-alone project but is now a part
of the Xfce project, under the name "Xfce Foundation Classes". The home
page URL is http://xfc.xfce.org. Could you please remove the GFC entry
and add the Xfce Foundation Classes to your list.

Thank you. Regards,

Jeff Franks.