Use Texture2DArray instead of Texture3D for compressed pixel storage test.
Use Texture2DArray instead of Texture3D for compressed pixel storage test.

Mesa drivers (rightfuly) complained that S3TC is not supported on 3D
textures, the packing had weird behavior on NVidia but it passed w/o
problems on AMD. Now should be okay on all three, yay!

MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum