Fix RGBA4 and RGB5A1 format & internalFormat
Fix RGBA4 and RGB5A1 format & internalFormat

jdryg/bgfx,emoon/bgfx,jdryg/bgfx,mendsley/bgfx,emoon/bgfx,emoon/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,jpcy/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,mendsley/bgfx,jpcy/bgfx,jdryg/bgfx,jpcy/bgfx,bkaradzic/bgfx,mendsley/bgfx,LWJGL-CI/bgfx,jdryg/bgfx,jpcy/bgfx