add spice-protocol build dependency

Gerd Hoffmannrequested to merge
(removed):bz1874926-enable-vnc-cut-paste into c9s

Bugzilla: 1874926

Needed for qemu-vdagent (aka vnc cut+paste support).

Signed-off-by: Gerd Hoffmann kraxel@redhat.com

Edited by Miroslav Rezanina

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