Diageo Dips on Dispiriting Outlook  LONDON (Reuters) - Shares in Diageo Plc &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=DGE.L target=/stocks/quickinfo/fullquote"&gt;DGE.L&lt;/A&gt; fell on  Thursday as the world's biggest spirits firm said tough  European markets and a weak dollar will hold back growth after  an expected 1 percent rise in annual earnings.