The wooden sign on the wall at the original Sonny Bryan’s Smokehouse on Inwood Road says “Real Texas Bar-B-Que.” It’s next to a large black and white photo of Sonny himself. The late Dallas BBQ patriarch, dressed in a white shirt, white apron and white chef’s hat, has a gentle smile on his face and a big carving knife in his hand. Once upon a time, that sign might have been accurate. Not anymore. The same goes for all four of the joints the Posse visited on a recent Saturday during its Roots of Dallas BBQ Tour, which included the…