if the TGSI has CLIPDIST[0], we have to translate that into
vec4(gl_in[0].gl_ClipDistance[0], gl_in[1].gl_ClipDistance[1],
gl_in[0].gl_ClipDistance[2], gl_in[2].gl_ClipDistance[3]);
This fixes:
tests/spec/glsl-1.50/execution/geometry/clip-distance-bulk-copy.shader_test
tests/spec/glsl-1.50/execution/geometry/clip-distance-in-param.shader_test
tests/spec/glsl-1.50/execution/geometry/clip-distance-in-values.shader_test
Tested-by: Jakob Bornecrantz <jakob@collabora.com>