Lance Armstrong threw up his arms in surrender yesterday and insisted in true weasel fashion that he's really rooting for New York, not Paris, to clinch the 2012 Olympics. "If I were on the selection committee, I would be rolling for New York City," Armstrong sniveled a day after snubbing his own country when he said in interviews that he wanted Paris to get the Games. The biker's international flip-flop occurred just one day after The Post pictured him in front of the Arc de Triomphe wearing a beret and clad in a bike jersey decorated with a weasel head...