LAS VEGAS – Pop diva Elton John, never at a loss for feuds, launched a new one yesterday. Sir Elton’s target this time is The Sun, a British tabloid, which enraged the mercurial star by reporting that Sir Elton and partner David Furnish have to get married because Furnish has gotten an unnamed Canadian pop star pregnant, "and the baby needs a father." “Bullocks! Utter twaddle! Steaming horse droppings!” thundered Sir Elton by cell phone from an undisclosed jewelry store in Las Vegas. “I’ll sue those bastards for everything they’ve got. By the time I’m through with them, they’ll be...