'too different' from the normal of the triangle with the
normal of the triangle for interpolating the normals which
are used by the physics.
This should make 'smooth normals' more useful for tracks where
track and (say) a wall are connected, resulting in incorrect
normals for the physics.
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@11989 178a84e3-b1eb-0310-8ba1-8eac791a3b58