Elsa Keslassy International CorrespondentMatt Dillon (“The House That Jack Built”) and Charlotte Gainsbourg (“Antichrist,” “Nymphomaniac”) are attached to star in Fred Garson’s “An Ocean Apart,” a period drama about the romantic affair between French philosopher Simone de Beauvoir and American writer Nelson Algren.The film is being developed by French producer Olivier Delbosc at Curiosa Films, which is presenting Xavier Giannoli’s Venice competition player “Lost Illusions” and Yvan Attal’s “Les