server/spice-server.syms: add missing global labels
server/spice-server.syms: add missing global labels

Although global is the default, this makes the file more consistent.

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