Tacking issue for removal of LIBGL_DRIVERS_PATH in mesa

[NickCao]

Describe the bug

In (yet to be released) Mesa 24.2, LIBGL_DRIVERS_PATH is dropped in favor of making all the GL frontends link directly to the Gallium backend driver.

See Mesa 24.2 Enjoyed Some Last Minute Code Cleaning & Modernization
And glx/egl/gbm: link directly to gallium

We have a few in tree references to LIBGL_DRIVERS_PATH that should be removed/replaced:

nixpkgs/pkgs/by-name/pl/plex-desktop/package.nix

Line 146 in 1d3f999

LIBGL_DRIVERS_PATH=$PLEX_USR_PATH/dri

nixpkgs/pkgs/development/libraries/mesa/llvmpipe-hook.sh

Line 5 in 1d3f999

export LIBGL_DRIVERS_PATH=@drivers@/lib/dri

nixpkgs/nixos/tests/turbovnc-headless-server.nix

Line 125 in 1d3f999

"(env DISPLAY=:0 LIBGL_DRIVERS_PATH=/nonexistent glxgears -info | tee /tmp/glxgears-should-fail.stdout) 3>&1 1>&2 2>&3 | tee /tmp/glxgears-should-fail.stderr >&2 &"

Notify maintainers

[emmanuelrosa]

Although it's outside of Nixpkgs, it's worth noting that nixGL is also affected.