BERTHOLD LUBETKIN, an architect who played a leading role in founding the Modernist school in Britain in the 1930s, died Tuesday age 88 in London . . . POLICE FIRED rubber bullets and tear gas to disperse rock-throwing crowds in the black South African township of Khayelitsha Thursday after an explosion set the town council building on fire. Two blacks were reported killed . . . BULLFIGHTER Marcial Lalanda, one of Spain's top matadors of the 1920s and 1930s, died Wednesday night in Madrid at age 87.