Fix passing visibility through for mac.
Fix passing visibility through for mac.

mbrubeck/glutin,notriddle/glutin,paulrouget/glutin,christopheraugustus/glutin,vvuk/glutin,frewsxcv/glutin,kornholi/glutin,mmatyas/glutin,jdm/glutin,TyOverby/glutin,nox/glutin,fkaa/glutin,mneumann/glutin,mvdnes/glutin,mitchmindtree/glutin,glennw/glutin,bvssvni/glutin,nc4rrillo/glutin,servo/glutin,tempbottle/glutin,mbrubeck/glutin,tomaka/winit,ozkriff/glutin,vberger/glutin,robertknight/glutin,Ms2ger/glutin,retep998/glutin,larsbergstrom/glutin,Jayflux/glutin,aepsil0n/glutin,adambadawy/glutin,akiss77/glutin,tomaka/glutin,TimNN/glutin,ecoal95/glutin,pcwalton/glutin