In Hollywood, everything old is new again. As much as we whine and cry and gnash our teeth, intellectual property is king, simply because it’s there, available to be rebooted, rehashed, reheated. Remember “Shaft”? How about more “Shaft,” but with more hacky jokes about millennials and an incredibly ugly homophobic streak? After a trilogy of ’70s blaxploitation films, a short-lived TV series and a 2000 reboot, cool New York City detective John Shaft is back again in, you guessed it, “Shaft,” with a modern update that goes completely sideways in all the wrong ways. This Shaft is a bad mother all right, and it’d be better if he just shut his mouth.