President Clinton presented the Malcolm Baldrige National Quality Award to Armstrong World Industries's building products operations and to the telecommunications products division of Corning. . . . American Greetings, spurned in its second bid for Gibson Greetings, won't attempt a hostile takeover but may sweeten its offer, its chairman said. . . . Billionaire investor Warren Buffett acquired 4.9 millions shares of McDonald's stock in late 1994, according to a filing with the Securities and Exchange Commission.