AUSTIN, Texas (Reuters) – As tens of thousands of music fans converge on the Texas capital for the Austin City Limits Music Festival this weekend, one performer will make a stop at the original “Austin City Limits” – the longest-running music show on American television. Jack White, the former White Stripes rocker who plays the festival on Saturday, is scheduled to tape an “Austin City Limits” TV episode on Sunday. Last year, five ACL festival acts – Coldplay, Arcade Fire, the Head and the Heart, Gomez and Randy Newman – made the same trip. …