LYTHAM ST ANNES, England, July 21 (Reuters) - World numbertwo Rory McIlroy is full of frustration that he has lost hismojo in recent weeks and believes the situation is starting toaffect his confidence levels. The 23-year-old Northern Irishman reeled off a string oftop-five finishes on the European and U.S. tours early in theyear before a slump caused him to miss four out of five cuts. McIlroy's ...