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backend-pipewire: add fence to synchronize on finish of render

Michael Tretter requested to merge m.tretter/weston:pipewire-backend-add-fence-to-synchronize into main

If the PipeWire-backend renders to a DmaBuf, try to use a fence to synchronize the submit of the next PipeWire buffer to the completion of the current render process.

This ensures that the GPU rendering is finished before the buffer is passed to PipeWire.

If fences are not available, the buffer is submitted without explicit synchronization as before.

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