Added mouse scroll support for OSX.
Added mouse scroll support for OSX.

cyndis/bgfx,septag/bgfx,ming4883/bgfx,mmicko/bgfx,ktotheoz/bgfx,Extrawurst/bgfx,emoon/bgfx,darkimage/bgfx,janstk/bgfx,andr3wmac/bgfx,andr3wmac/bgfx,bkaradzic/bgfx,janstk/bgfx,LWJGL-CI/bgfx,andr3wmac/bgfx,mmicko/bgfx,bkaradzic/bgfx,attilaz/bgfx,BlueCrystalLabs/bgfx,BlueCrystalLabs/bgfx,mendsley/bgfx,LWJGL-CI/bgfx,0-wiz-0/bgfx,Vertexwahn/bgfx,ktotheoz/bgfx,elmindreda/bgfx,LSBOSS/bgfx,attilaz/bgfx,LSBOSS/bgfx,ocornut/bgfx,emoon/bgfx,jpcy/bgfx,mcanthony/bgfx,cuavas/bgfx,ktotheoz/bgfx,marco-we/bgfx,jdryg/bgfx,Synxis/bgfx,elmindreda/bgfx,sergeScherbakov/bgfx,attilaz/bgfx,jdryg/bgfx,MikePopoloski/bgfx,Extrawurst/bgfx,kondrak/bgfx,jpcy/bgfx,cuavas/bgfx,BlueCrystalLabs/bgfx,jdryg/bgfx,septag/bgfx,LWJGL-CI/bgfx,ming4883/bgfx,Vertexwahn/bgfx,MikePopoloski/bgfx,cyndis/bgfx,darkimage/bgfx,mmicko/bgfx,aonorin/bgfx,mendsley/bgfx,ocornut/bgfx,mcanthony/bgfx,v3n/bgfx,mendsley/bgfx,cyndis/bgfx,fluffyfreak/bgfx,mcanthony/bgfx,aonorin/bgfx,kondrak/bgfx,ocornut/bgfx,bkaradzic/bgfx,emoon/bgfx,sergeScherbakov/bgfx,0-wiz-0/bgfx,septag/bgfx,kondrak/bgfx,v3n/bgfx,v3n/bgfx,elmindreda/bgfx,janstk/bgfx,fluffyfreak/bgfx,Extrawurst/bgfx,ming4883/bgfx,Synxis/bgfx,jpcy/bgfx,jdryg/bgfx,fluffyfreak/bgfx,0-wiz-0/bgfx,cuavas/bgfx,aonorin/bgfx,fluffyfreak/bgfx,bkaradzic/bgfx,darkimage/bgfx,sergeScherbakov/bgfx,Vertexwahn/bgfx,MikePopoloski/bgfx,jpcy/bgfx,Synxis/bgfx,LSBOSS/bgfx,LWJGL-CI/bgfx,marco-we/bgfx,marco-we/bgfx