Things I would’ve been surprised to write a decade ago: I recently heard a new Macklemore song featuring KRS-One and produced by DJ Premier. In it, Mack finds his old backpack (that is to say, is really rapping) and empties it out, spilling out Krylon cans, Krink markers and Boot Camp Clik tapes. Is this a canny move to strengthen his base among the cargo-shorted rap-conservative contingent, the cats who thrive on rap message boards in 2016, who’d rather watch a million Lord Jamar interviews than even hear the words “Same” and “Love” together again? I dunno, but the second that he and Ryan Lewis’s This Unruly Mess I’ve Made is in my iTunes, I’m gonna peep the song with YG, ’cause I have to know exactly how mad to get…