exas. It's the second-largest state in America - bigger than your average European country - and it looms even larger in the popular imagination. It's a mythical place where people in big hats drive big pickup trucks and eat even bigger steaks on some of the world's biggest ranches.    But if there's one thing Texas is small-minded about -as Matthew McConaughey found out back in November - it's bongo playing in the nude late at night. The actor was arrested in Austin when police investigating a noise complaint found him in flagrante delicto wearing only his birthday suit with the incriminating bongos as well as what was termed "drug paraphernalia in plain view." Charges were later dropped.    Most of us caught disturbing the neighbors in the nude wouldn't find our name in the paper the next day.  But then most of us aren't Matthew McConaughey, big Hollywood star who - bongo police aside - still wears his Texas heritage like a pair of comfortable jeans.    He's a native son of Uvalde, a town about 80 kms west of San Antonio. The family later moved to Longview, Texas, which sits right alongside the Louisiana border. And when he got older, McConaughey went off to school at the Austin campus of the University of Texas.    The Lone Star state is still something that permeates his every move as he's gone from the Hollywood "It Boy" sans resume to a serious actor in training. "His secret is that he's this wild Texas boy who looks like the boy next door," says Joel Schumacher, who directed McConaughey in A Time to Kill. "It's the danger lurking behind those good looks that makes him so appealing."    "I call it a Texas state of mind," says McConaughey. "You have certain things  that you think about when you set out to make a life for yourself. You have your family name, for one. And you're an American; you've got your patriotism, that's a reason you have to do things right. Another one is 'under God,' whatever that