screencast: Drop the fence

Aleix Pol Gonzalez requested to merge work/apol/screencast-fence-off into master

The clients receiving the dmabuf buffer fences should already be taking them into account. This will reduce the time that kwin needs to hold onto a buffer and in turn make the implementation a bit simpler.

BUG: 467574

As discussed a few weeks back.

Tested against recordme and OBS.

Edited by Aleix Pol Gonzalez

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