The mayor of Mount Vernon tipped off a political pal that he was about to be busted for allegedly molesting a 12-year-old girl — two weeks before the creep was locked up, a bombshell lawsuit claims. Mayor Shawyn Patterson-Howard allegedly summoned disgraced basketball coach Dwayne Murray to Mount Vernon City Hall in late April to warn her “close associate” of the pending bust, one of several hair-raising claims laid out in the suit filed Monday by community activist Gabriel Thompson. “I just see lawlessness,” Thompson told The Post. “She needs to resign. Are you kidding me? The mayor of a...