Systems with GLVND load the actual EGL implementation in a different way
when the GL driver is dlopen'ed and therefor we need to tell GLVND which
vendor implementations are available on the system. As snapd is not yet
exposing this to the snap we have to ship a small set of configs on our
own until that is fixed.
We're using the desktop helpers now to setup all necessary environment
variables for GL drivers etc. and only keep a small set of extra changes
on top for things the desktop-helpers don't support yet.