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mesa/st: Lower user clip planes for tess eval too

Jesse Natalie requested to merge jenatali/mesa:lower-tes-ucp into main

One new patch from !14399 (merged) that's in common code. Now that the d3d12 driver claims compat GLSL 400 (since ARB_gpu_shader5 is supported), a couple new tests lit up for using tessellation shaders with compat contexts, and gl_ClipVertex coming out of TES was broken.

The logic in st_atom_shader.c leads me to believe this was supposed to work, but was incomplete to actually finish it.

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