linuxPackages.ati_drivers_x11: remove

[jonringer]

Motivation for this change

ATI driver is no longer supported for kernels > 4.1. We only carry kernels >= 4.4.

Doing house cleaning before post-branch-off "mark all failing builds as broken" event.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• 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 nixpkgs-review --run "nixpkgs-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)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[jonringer]

16 packages removed:
ati-drivers (†15.12-4.14.232) ati-drivers (†15.12-4.19.190) ati-drivers (†15.12-4.4.268) ati-drivers (†15.12-4.9.268) ati-drivers (†15.12-5.10.37) ati-drivers (†15.12-5.10.37) ati-drivers (†15.12-5.10.37) ati-drivers (†15.12-5.11.16) ati-drivers (†15.12-5.11.16) ati-drivers (†15.12-5.11.21) ati-drivers (†15.12-5.11.21) ati-drivers (†15.12-5.11.21) ati-drivers (†15.12-5.11.21) ati-drivers (†15.12-5.12.4) ati-drivers (†15.12-5.4.119) ati-drivers (†15.12-5.9.0-2020.11.20)

[Ma27]

Evaluation seems to fail here when trying to build a system with documentation.nixos.includeAllModules = true;. Currently investigating why.

EDIT: nvm, it's apparently related to another module I wrote, sorry for the noise!