by Ralph Russo, Associated Press BROOKLYN—Brady Manek outscored Virginia in the first half on the way to 21 points and No. 25 North Carolina cruised into the Atlantic Coast Conference semifinals with a 63-43 victory Thursday night. The third-seeded Tar Heels (24-8) will face seventh-seeded Virginia Tech (19-13) on Friday night in Barclays Center, having won 12 of 14. The sixth-seeded Cavaliers leave Brooklyn with an ignominious record. They scored just 13 points in the first half against UNC, the fewest in the first half of an ACC Tournament game in the shot-clock era. Jayden Gardner was the o…