client: add --version cmdline option to spicec
client: add --version cmdline option to spicec

This fixes freedesktop bug #33907

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