A generation has grown up in the closed world of Orania, South Africa’s whites-only Afrikaner enclave on the margins of the rainbow nation that this year celebrates its 35th anniversary. And more young people from the white minority are moving to the small town, drawn by a new college and a sense of home carved out of the country’s melting pot of cultures. Mostly under 30 The Friday night crowd at Stokkies bar appeared mostly aged under 30, all …