Ask Clint Eastwood to select personal favorites from amongst his movies and you might be surprised by one choice. It's an old-fashioned theme, Eastwood says, but if, as a film director, I ever wanted to say something, you'll find it in Bronco Billy. One of the funniest and most touching films you'll see this or any year (Rona Barrett, ABC-TV) casts Eastwood as the ace sharpshooter and head of a modern Wild West tent show. Life's been hard for Billy and his ragtag troupe. But their luck might change in the unlikely person of a highfalutin society dame (Sondra Locke). You may already have a favorite Eastwood role. Watch Bronco Billy and, chances are, you'll have another.