Fixed MinGW build.
Fixed MinGW build.

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