spoonful of sugar when she was working with Dick Van Dyke during their “daunting” rehearsals for “Mary Poppins.”The iconic actress, 88, applauded the “Bye, Bye, Birdie” star, 98, in Thursday’s “Dick Van Dyke 98 Years of Magic CBS” special.The “Princess Diaries” actress happily recalled meeting Van Dyke during the shooting of the 1964 Disney musical. She divulged during the two-hour show how it was a hot, September day that she encountered the actor at practice sessions.The crew had built a stage outside the studio where they were filming.