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r300: remove gl_ClipVertex early

Pavel Ondračka requested to merge ondracka/mesa:r300_remove_clipvertex into main

There is no HW support, but in some cases the shaders mostly work even if we ignore it, and so far we have just done so. However since the driver didn't know to what output position in the PVS we should redirect it, it ended in the first slot. Importantly, if the CLIP_VERTEX output would be written after position (which actually belongs in the first slot) it would overwrite it and things blow up.

So just remove it early, and also improve the warning a bit, including the part that we could use draw module to actually emulate the feature.

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