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backend-drm: allow to disable GBM modifiers

Stefan Agner requested to merge agners/weston:disable-modifiers-env into master

Allow to disable GBM modifiers at runtime using the environment variable WESTON_DISABLE_GBM_MODIFIERS.

This can be useful for debugging or when modifiers cause issues, e.g. in case modifiers use higher memory bandwidth and hence impose a lower resolution limit as it is the case with Intel Kaby Lake graphics.

Related to: #404 (closed) Signed-off-by: Stefan Agner stefan@agner.ch

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