PERSPECTIVE ON CIVIL RIGHTS : The True Concern Is Racial Justice Gayle Pollard Terry, Times Staff Writer; C. Lani Guinier was nominated by President Clinton to head the Justice Department's civil rights division. But the President withdrew the nomination of the 43-year-old University of Pennsylvania law professor last month after conservatives complained that she favored race-based voting rights remedies. Guinier was interviewed by Times editorial writer Gayle Pollard Terry last week during the annual convention of the National Assn. of Black Journalists in Houston. and