LOS ANGELES (Reuters) - Rapper and music producer RZA is best known as the leader of the hip-hop group the Wu-Tang Clan which also includes such popular members as Method Man, Ghostface Killah and the late Ol' Dirty Bastard. RZA branched out into film, taking on small acting roles and scoring music, including the soundtrack for Quentin Tarantino's "Kill Bill: Vol. 1." Now, nearly a decade later, 43-year-old RZA has combined his childhood love of martial arts movies to co-write with Eli Roth the feature film "The Man With the Iron Fists," which he also directs and acts in the title role. ...