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etnaviv: make non-emulated GL_ARB_shadow work

Lucas Stach requested to merge lynxeye/mesa:etnaviv-shadow-compare into main

On <= HALTI2 GPUs the GL_ARB_shadow texture compare operation is emulated by a shader lowering. New GPU cores have native support for the compare operation, but until now driver support for it was actually broken in different ways on all GPU generations.

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