Raffles van Exel

One of Whitney Houston's close friends -- a mysterious man who's been widely accused of supplying the singer with coke before her death -- is declaring war on media outlets that ran with the drug story ... and now, he's on a crusade to clear his name. The friend -- an enigmatic celebrity sidekick…

Whitney Houston's close friend -- Raffles van Exel -- is "extremely relieved" he is not in the crosshairs of the Beverly Hills Police Department in the singer's death investigation. Several reports were posted this week that someone removed cocaine from Whitney Houston's hotel room before…