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etnaviv: fix alpha blend with dither on older GPUs

Lucas Stach requested to merge lynxeye/mesa:etnaviv-alphablend-old into main

While setting up DITHER_MODE allows alpha blending to work properly together with dithering on new GPUs, older cores still change the render target. As dithering is optional and implementation defined we can simply disable it on the affected GPUs, when alpha blending is enabled to work around this bug.

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