TORONTO, CANADA - James Coburn is one of those movie stars who inspire an instinctive reaction in a lot of people. They seem to believe he's getting away with something. Maybe it's that grin, the one that somehow suggests that fate has given Coburn a free lifetime pass. In the 1960s, that decade when the generation under 30 seemed drenched in euphoria, Coburn's grin hinted that he was...well, always stoned. Now it is 1980, and the grin still hints at the same thing. James Coburn is not, however, always stoned. He just looks that way; it's part of his image.