Tell pacman which libgl provider to install

The gpu-viv-bin-mx6q-dfb, gpu-viv-bin-mx6q-fb, gpu-viv-bin-mx6q-x11 and gpu-viv-bin-mx6q-wl libgl providers don't work for some reason.
This will ensure a working libgl provider is installed.
Merge pull request #13 from jman6495/master

Tell pacman which libgl provider to install