Updated AppVeyor CI script.
Updated AppVeyor CI script.

fluffyfreak/bgfx,mendsley/bgfx,emoon/bgfx,fluffyfreak/bgfx,jpcy/bgfx,MikePopoloski/bgfx,jpcy/bgfx,septag/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,jdryg/bgfx,MikePopoloski/bgfx,bkaradzic/bgfx,jdryg/bgfx,septag/bgfx,septag/bgfx,bkaradzic/bgfx,mendsley/bgfx,mmicko/bgfx,Synxis/bgfx,LWJGL-CI/bgfx,emoon/bgfx,Synxis/bgfx,jpcy/bgfx,fluffyfreak/bgfx,LWJGL-CI/bgfx,mmicko/bgfx,attilaz/bgfx,mendsley/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,attilaz/bgfx,bkaradzic/bgfx,emoon/bgfx,fluffyfreak/bgfx,jdryg/bgfx,attilaz/bgfx,MikePopoloski/bgfx,jpcy/bgfx,Synxis/bgfx,mmicko/bgfx