lavapipe: further limit accurate_a0 hack

Roland Scheidegger requested to merge sroland/mesa:llvmpipe_a0_hack_again into main

lavapipe: further limit accurate_a0 hack

With lavapipe the previous change to only enable the hack when there's no textures bound doesn't work anymore, since we don't have that information when using the texture handles. So add another random state restriction which is sufficient to pass tests. (This really needs a better long term solution.)

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