To avoid trying to do PRIME detection on fake `libGL.so` as used by e.g.
Renderdoc or Primus, we skip detection if there's a `libGL.so` in
`LD_LIBRARY_PATH`... and our luck is that Steam defines it and includes
system paths too, thus the actual system `libGL`... 🤦
So if we detect Steam, we skip this check.
Co-authored-by: Hein-Pieter van Braam-Stewart <hp@tmm.cx>
Rémi Verschelde
ae850177a3
