David Honeyboy Edwards — at age 94 and 3/4s one of very few survivors of the original Delta blues generation — gigged at B.B. King’s Blues Club on NYC’s 42nd St. last week. He held the stage with little help from his two sidemen for nearly an hour, after receiving a Lifetime Achievement Award from the National Guitar Museum. His voice a warm burr reaching for a high, tight little cry, his acoustic guitar playing quirky but deliberate, Edwards was completely at ease delivering songs he’s performed most of his long life. He knows exactly what he’s doing.