Thats because there is a hell of a lot of coding in mech eng degree now. I actually did a few programming courses in my comp sci degree as an elective that were titled mech302 mech326 and didnt have the equivalent in the comp-sci department (which was disturbing actually).

I think reason being is that before, mechanical engineering was just purely, mechanical engineering, where as now the mechanical engineering degree (in my old uni anyway) was combined with mechatronic, which was robotics, and alot of low level process control type courses that for obvious reasons required alot of programming ... They basically fell under the same department