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American-led Western powers and South Africa struck a deal Thursday on how to bring the troubled territory Namibia to independence. The South Africans, while going ahead with their own elections there, will reopen negotiations for later elections supervised by the United Nations. South Africa stopped short of a firm commitment to U. N elections, however, and the Westerners rejected the legitimacy of the South African-planned voting. Moreover, South African Minister Peter W. Botha raised a potentially major side issue, saying his country will not withdraw its troops from the mine-rich territory until the 12-year-old war with black nationalist guerrillas ends.