A Brooklyn precinct commander is being investigated by the NYPD for allegedly threatening the celebrity’s life — telling his officers at a roll call to “shoot him on sight,” the Daily News has learned. Deputy Inspector Emanuel Gonzalez, the commanding officer of the 72nd Precinct in Sunset Park, allegedly made the threat last June 7, when the actor and “In Da Club” rapper was expected to attend an NYPD sanctioned boxing match in the Bronx. During a roll call inside the 72nd Precinct stationhouse, Gonzalez told his officers if they saw 50 Cent at the boxing match, known as a...