pkgs/stdenv/darwin: move bootstrap files definitions to bootstrap-fil…

[trofi]

…es/ directory

The change moves definition of bootstrap files slightly closer to linux structure to eventually allow those to update in bulk: #253713

Description of changes

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• 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/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 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.

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[trofi]

On linux host tested the following, it's a no-op:

$ nix build -f. hello --argstr system x86_64-darwin; nix build -f. hello --argstr system aarch64-darwin;

My mild worry is on inherit (localSystem) system;. I think it's removal should be a no-op on darwin as well. But mentioning it just in case.

[reckenrode]

nix-instantiate . -A stdenv returns the same paths for aarch64- and x86_64-darwin before and after cherry-picking this PR onto master. More alignment with Linux is usually a good thing. LGTM

[lovesegfault]

@ofborg eval

[toonn]

I think <nix/fetchurl.nix> refers to this fetchurl.nix? And that indicates the system argument as obsolete, so it's probably safe to drop.

LGTM