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Add a sync_fence event to the export-dmabuf protocol.

Simon Ser requested to merge github/fork/cyanreg/master into master

Created by: cyanreg

This commit adds a sync_fence FD to the export-dmabuf protocol, allowing for clients to synchronize their readout of the frame with the last operation the compositor performs to the frame, thus eliminating any race conditions where the compositor gives the frame to a client while still compositing to it.

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