SFI: remove obsolete using directives
SFI: remove obsolete using directives

swesterfeld/beast,GNOME/beast,GNOME/beast,swesterfeld/beast,GNOME/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,GNOME/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,GNOME/beast,GNOME/beast,GNOME/beast