*****MEGALODON-SIZED SPOILERS!***** Five years ago saw the summer release of “The Meg,” a Chinese-US coproduction based on a 1997 book by Steve Alten (I swear). “The Meg” was a big, silly, check-your-brain-at-the-door action flick that wisely chose not to compete with “JAWS” in terms of direction, innovation, skill, or talent. If anything, “The Meg”’s humble…