client/display_channel: gcc 4.6.0 unused fixes
client/display_channel: gcc 4.6.0 unused fixes

ya-mouse/spice,fgouget/spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,dezelin/spice,elmarco/spice,fgouget/spice,Fantu/spice,Fantu/spice,elmarco/spice,alon/spice-server,SPICE/spice,Fantu/spice,dezelin/spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,SPICE/spice,freedesktop-unofficial-mirror/spice__spice,dezelin/spice,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,elmarco/spice,ya-mouse/spice,fgouget/spice,dezelin/spice,ya-mouse/spice,alon/spice-server,mathslinux/spice,dezelin/spice,alon/spice-server,elmarco/spice,SPICE/spice,Fantu/spice,elmarco/spice,mathslinux/spice,mathslinux/spice