accessibility configuration

[Benedikt Meurer]

Jani Monoses wrote:
>>xfce4-session already offers support to start AT services (if build with
>>gconf), but that's only a starting point.
> 
> According to this bug entry gconf was replaced by full libgnome deps
> http://bugzilla.xfce.org/show_bug.cgi?id=734
> 
> but it seems not to need any gnome APIs besides gconf, and builds fine
> with this patch

Committed with revision 22949, thanks.

> Jani

Benedikt