Addons start hitting the new surface.DrawPoly error

In #next-update, Redox (22 Oct) and Nykez (23 Oct) saw bad argument #1 to 'DrawPoly' (table must contain at least three vertices), for example from cl_arc.lua. On 25 Oct Vitroze asked whether it would be fixed. Nykez said it is a bug fix and code has to be fixed, and Rubat agreed: "its not valid code on your end". Beelzebub posted a one-line patch for the bad math in luabee's arc library.