A teenage boy was stabbed in broad daylight outside a Bronx supermarket Saturday and left wounded, police sources said. The 13-year-old was stabbed in the stomach outside C-Town at 1612 Westchester Avenue in the Bronx’s Soundview neighborhood at 5:23pm, police sources said. He was taken to Jacoby Hospital on Pelham Parkway by EMS workers after the assault and is in stable condition. Blood could be seen on the concrete sidewalk at the scene as a group of police officers cordoned off the area in front of the store. No arrests have been made in the incident and the search for…