JOHANNESBURG (Reuters) - U.S. President Donald Trump's offer to rehouse white South Africans as refugees fleeing persecution may not spur quite the rush he anticipates, as even right-wing white lobby groups want to "tackle the injustices" of Black majority rule on home soil. Trump on Friday signed an executive order to cut U.S. aid to South Africa, citing an expropriation act that President Cyril Ramaphosa signed last month aiming to redress land inequalities that stem from South Africa's history of white supremacy. The order provided for resettlement in the U.S. of "Afrikaners in South Africa who are victims of unjust...