(Reuters) - Diageo Plc , the world's largest spirits maker, abandoned its annual forecast for sales and profit growth on Thursday, and suspended its 4.5 billion pound (4.52 billion pounds) share buyback programme in response to the coronavirus pandemic.The Johnnie Walker whisky maker is the latest company to pull its guidance as the closure of bars and restaurants around the world due to lockdowns imposed by governments hit its sales.Production facilities in many countries including India and in..