int cl_traceline_endcontents;
-float CL_TraceLine (vec3_t start, vec3_t end, vec3_t impact, vec3_t normal, int contents, int hitbmodels)
+float CL_TraceLine (const vec3_t start, const vec3_t end, vec3_t impact, vec3_t normal, int contents, int hitbmodels)
{
double maxfrac;
trace_t trace;