Damon Wayans Announces He's Quitting 'Lethal Weapon'

[[tmz:video id="0_9nk71d1k"]] Damon Wayans says he's had enough of working on "Lethal Weapon," so come December ... he's done. The actor made the stunning announcement to Electronic Urban Report Wednesday, saying ... "I'm a 58-year-old diabetic and I'm…