Fixed ETC1 block decoding.
Fixed ETC1 block decoding.

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