PHOTO (UNC Athletics): Roy Williams masked up in a strange college basketball season. By TOM SHANAHAN Everyone knows by now Duke and North Carolina aren’t playing for an ACC title or No. 1 seed in the NCAA Tournament. They're still clinging to hopes for an NCAA bid. But it doesn’t seem to impact the intensity of the game. It didn’t matter the first time around, even though much was made of the teams meeting as unranked opponents for…