“Ice Age: Collision Course,” the fifth installment in the 14-year-long saga of animated prehistoric animals, will, with any luck, also be the last. Lazy, scattershot and excruciatingly unfunny, the movie is a hazard to the very young, who might come away with the erroneous impression that movies don’t get any better than this. We get it: It’s summertime and the kids need to be entertained.