The Knicks are still tinkering with the end of the roster. Dylan Windler, a 6-6 guard and former first-round pick, is signing with New York after four years with the Cavaliers, a source confirmed. The 26-year-old, who spent time in the G-League the last two seasons, is a spot-up 3-point shooter with disrupting size on defense. He averaged 3.3 points in 11.4 minutes over 84 career games with …