Place reserved 1/2 cup drippings in roasting pan or 12-inch skillet. Stir in flour. Cook over low heat, stirring constantly and scraping up brown bits in pan, until smooth and browned. Gradually stir in 2 cups broth mixture. Cook, stirring constantly, until mixture boils and thickens. Remove meat from neck; finely chop meat and giblets and add to gravy if desired. Stir in salt and pepper.