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Draft: Enable zero-copy to discrete GPUs

Daniel van Vugt requested to merge vanvugt/mutter:enable-zero-copy-secondary-gpus into main

Zero copy was written for and previously only attempted on DisplayLink (where it always works in my experience). Now we try it on discrete GPUs too. This only seems to work for nouveau but the benefit is huge:

Before: 6.9ms secondary GPU copy
After: 0.8ms zero copy

Edited by Daniel van Vugt

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