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mesa/main: allow S3TC for 3D textures

Pavel Asyutchenko requested to merge svenny/mesa:svenny/tex3d-s3tc into main

This is allowed by D3D, RADV, ANV and Nvidia GL drivers at least, so it should work on any hardware with S3TC.

OpenXRay uses DXT5-compressed 3D texture for rain splash effects. I've confirmed this patch makes it work properly on radeonsi and zink->nvidia.

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