After the Sony hack forced "The Interview" out of its prime Christmas release slot, "Blackhat" seemed to be perfectly primed to take its place. Alas, Universal kept the film in January. And maybe that was for the best, because even with its timely sounding synopsis, "Blackhat" plays like a relic, recalling less the anxiety of today's headlines and more the warmed-over memories of yesterday's forgettable action junk and silly techno-trash.