Test: ensure that all extensions are available.
Test: ensure that all extensions are available.

I'm not really sure what extensions ARB_cube_map_texture_array expects
and what not, so checking for everything just in case.

MiUishadow/magnum,DerThorsten/magnum,ashimidashajia/magnum,MiUishadow/magnum,DerThorsten/magnum,MiUishadow/magnum,DerThorsten/magnum,MiUishadow/magnum,DerThorsten/magnum,MiUishadow/magnum,ashimidashajia/magnum,MiUishadow/magnum,ashimidashajia/magnum,DerThorsten/magnum,ashimidashajia/magnum,ashimidashajia/magnum