It ain’t easy being short. Boiled away of its particulars, that’s the central theme of Morten Tyldum’s Headhunters, although “don’t involve yourself in corporate espionage” could well be the larger takeaway. After all, no good whatsoever can come from invoking the wrath of Jaime Lannister, especially a Jaime Lannister armed with nano-technology designed in service to tracking human beings. But Tyldum instills an abundance of textbook male security in his hero, one Roger Brown (Aksel Hennie), a man who lives his life under constant self-induced stress and paranoia. What does Roger have to fear? He has a high-paying job as one of Norway’s top employment recruiters, a modern domicile of impeccable…