- Rebase to upstream spice-protocol 0.12.6, which adds:
  0.12.6
  + Add adaptive video streaming support:
    control playback latency and receive playback
    reports from the client.
  + Add agent capabilities for signaling guest line ending.
  0.12.5
  + Add agent file xfer success status
  + Add a client-disconnected agent message
  0.12.4
  + Add agent file copy support.
  + Add agent sparse monitors capability.
  + Add controller proxy message.
  0.12.3
  +Add a generic "port" channel