“Hairspray” was a movie. Now it’s a Broadway musical. And it’s going to be a movie again. Since the original movie wasn’t a musical, and Hollywood loves remakes anyway, the musical is going to be a movie, slated for 2005. Other musicals are running after the success of “Chicago” with producers anxiously waiting to see how this month’s release of “Phantom of the Opera” will fare. “The Producers,” like “Hairspray” has gone from movie to Broadway and is going to movie again. Upcoming in the good old-fashioned stage-to-screen bloodline are “Rent” and “Sweeney Todd” with others twinkling around in the rumor mill. Someone call me when they get around to “Pippin.”