Jack White’s Third Man Records label, not merely content to issue unique offerings of the ex-White Stripe’s music on a variety of formats, is now getting into the historical catalogue business with three forthcoming LPs of vintage blues masters. The new venture, Document Records, will present “the building blocks and DNA of American culture,” as the announcement put it. This first wave of recordings features the early works of Charley Patton, the lauded “Father of the Delta Blues”whose powerful voice influenced a young Howlin’ Wolf and whose guitar showmanship anticipated Jimi Hendrix’s…