spicec-x11: Listen for selection owner window destroy / close events too
spicec-x11: Listen for selection owner window destroy / close events too

These rarely happen as most apps have the decency to do a SetSelectionOwner
None before exiting. But some do not, so listen for these too.

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