Skip rendering of lines, points, polygons, and triangle fans, as these lead to crahses due to wrong access to the vertex lists. A fix would need major rewrite of the vertex cache, or at least some other render methods.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4288 dfc29bdd-3216-0410-991c-e03cc46cb475