The enemy of Jimmy Kimmel’s enemy is Jimmy Kimmel’s friend. Happily, Kimmel made a new friend Tuesday night when he and his guest Alicia Vikander bonded over Kimmel’s bitterest enemy of all: Matt Damon. “I know everyone tells everyone that he’s, like, the sweetest dude, but I worked with him,’’ Vikander said, having just wrapped filming on “Jason Bourne’’ with Damon. Kimmel’s beef with Damon, though all in fun, has been going on for years, beginning with a series of comical snubs during the early years of the show and festering into something far more ruthless. Now that Damon might win a second Academy Award , this time for “The Martian,’’ Kimmel needs all the allies he can get.