Cynthia Littleton Business EditorGavin MacLeod was a versatile and dependable actor who was a good friend to his co-stars during the seven-season run of “The Mary Tyler Moore Show,” Ed Asner told Variety in paying tribute to the TV veteran who died Saturday at the age of 90.MacLeod was an ally to his co-stars in any scene, recalled Asner, who played the voluble WJM-TV news director Lou Grant on the groundbreaking comedy that aired on CBS from 1970 to 1977.“He made everything easy,” Asner