Motivation for this change

This sort of goes alongside #42334 but the commits don't relate at all - it was just when I was in the process of packaging some 3D renderers. Open Shading Language and SeExpr are both dependencies that I had to add in the process.

Blender can be built with Open Shading Language support, but I will worry about adding this later.

This may build elsewhere than NixOS but I don't have a machine to test this on.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Fits CONTRIBUTING.md.