EXCLUSIVE: With one day left in scheduled negotiations between the WGA and the Alliance of Motion Picture and Television Producers over a new film and TV contract, a strike vote by the scribes is now looking like a real possibility. “That’s the way the wind is blowing,” a source with intimate knowledge of the ongoing talks told Deadline this afternoon. “We could have a strike vote very soon,” another insider told Deadline. While this could be posturing to light a fire…