Sam Presti of the Oklahoma City Thunder was announced Tuesday as the NBA’s executive of the year, the reward for building that team into a juggernaut that won a league-best 68 games this season.It is Presti’s first time winning the award and the first time since 1994 that the franchise — which was then called the Seattle SuperSonics — had its top executive voted as the winner. Bob Whitsitt won it that season.Presti, the Thunder’s executive vice president and general manager, got 10 first-place votes from a panel of 30 basketball executives — one from each of the NBA’s teams — who ranked their top three choices in order. Presti appeared on 22 of those 30 ballots.“I look at it like it’s a tremendous privilege to be able to do it,” Presti said at the start of the season when asked about his job. “Eventually someone else is going to be the person that’s doing it, and for me, while I’m serving the position, I think I’ve said this in the past, it’s not my job, it’s the Th …