mesa/st: Add support for GL_ARB_cull_distance (v2)

v2: don't bother with cull dist varyings except to assert.

Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann@mni.thm.de>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2 files changed