These New York food joints are 86ing the 76ers’ hometown sandwich.  Restaurants and bars from Manhattan to Long Island were banning “Philly” cheesesteaks from the menu as the Knicks take on the 76ers in the NBA’s Eastern Conference Semifinals. Empire State spots said they were rebranding Philly cheesesteaks as “the Philly SUCKS cheesesteak,” “the Big Apple cheesesteak” and other cheeky names in response to The Post calling around to see if establishments were ready to dunk on the B-rate city. Birdie owner and devout Knicks fan Louie Selvaggio. Stephen Yang for NY Post “Philly needs to understand, New York is the king,” said Louis Cretella, the co-owner of Dario’s Pizza in West Hempstead. Cretella, who has been a Knicks season ticket holder for more than a decade, personally changed the menu item from Philly cheesesteak to the Philly SUCKS cheesesteak in the restaurant’s computer system. Hard copy menus have the “Philly” crossed out and “F*** Philly” in black marker written over it.…