By Pratima Desai LONDON (Reuters) -Glencore has cut its stake in Century Aluminum by 10% to 33%, raking in millions following a share price rally ​triggered by U.S. tariffs on aluminium imports and a profit bonanza for local aluminium ‌smelters. U.S. President Donald Trump doubled tariffs on aluminium imports to 50% on June 4 with the aim of incentivising investment ‌in production of the metal in the United States. London-listed Glencore is Century's largest shareholder. It supplies Century with alumina ...