GoFundMeBillionaire Bill Ackman has donated $10,000 to his latest worthy cause: an all-out rager for a bunch of University of North Carolina fraternity brothers who took down a Palestinian flag put up by protesters and replaced it with a U.S. flag.Ackman, who also donated to counter-protest efforts at UCLA, where the pro-Israel crowd turned violent on Tuesday night, was matched by at least two other $10,000 donations as of Thursday afternoon. By that time, the Pi Kappa Phi fraternity had raised