linuxManualConfig: get rid of drvAttrs

[alyssais]

Description of changes

This is an attempt to make linuxManualConfig look a lot more like a normal package. Previously, about half the attributes passed to mkDerivation come from calling a "drvAttrs" function, which just served to alias some variables through function parameters. There wasn't really a system for which attributes came from drvAttrs, and which did not.

I've also made a few other minor changes, like re-ordering attributes to be more idiomatic, and using variables that were moved out of drvAttrs in the definitions of attributes that weren't in drvAttrs before. I've limited my changes here to what I can confidently do without causing any rebuilds.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.05 Release Notes (or backporting 22.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.