Shaquille O’Neal: Marvel Turned Me Down for the ‘Avengers’ (EXCLUSIVE)

Shaquille O’Neal will not be appearing in December’s “Avengers: Doomsday,” or any other “Avengers” film, for that matter. In an interview with Variety about his “Dunkman” league, the first professional dunking league where contestants from around the world compete for a grand prize of $500,000 — whose finals is airing the night of Aug. 25…