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Add util/u_drm_fourcc.h; Add PREFERRED_DRM_MODIFIER env-var for Intel drivers

Jordan Justen requested to merge jljusten/mesa:isl-preferred-modifier into main

util/u_drm_fourcc.h (and related py/c code) provides some utility functions for drm_fourcc.h.

PREFERRED_DRM_MODIFIER is an environment variable that raises the priority of the specified modifier. It doesn't guarantee this modifier will be used because modifier support depends on the platform.

Edited by Jordan Justen

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