don't load rpi functions unless bcm_host loads
don't load rpi functions unless bcm_host loads

RobertoMalatesta/glshim,lunixbochs/glshim,RobertoMalatesta/glshim,RobertoMalatesta/glshim,seandepagnier/glshim,seandepagnier/glshim,seandepagnier/glshim,lunixbochs/glshim,lunixbochs/glshim,RobertoMalatesta/glshim,seandepagnier/glshim,lunixbochs/glshim