OSMesa deprecated/removed

[ntardiff]

I just wanted to flag that the OSMesa library has been removed from Mesa as of 25.1.0 (https://docs.mesa3d.org/relnotes/25.1.0.html, https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33836), so people need to refrain from upgrading/downgrade if they want to use wb. This is particularly annoying for users who install Mesa via Homebrew, as Homebrew doesn't maintain older versions of Mesa easily accessible, though supposedly they're possible to access through workarounds that pull from older github commits.