libxml2: Remove Darwin bootstrapping hack

[jtojnar]

Description of changes

No longer appears to be needed? I successfully built libxml2 on Darwin community builder.

Reverts 36bb8d9.

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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[vcunat]

Sounds good, if the two stdenvs build. I'm not sure if ofBorg can manage to confirm. Perhaps also build the other stdenv on the community darwin? (I see it listing both, rosetta2 surely.)

[ghost]

FWIW I removed this as part of my change to update the darwin bootstrap tools as building the older libxml2 crashes clang-16.

• stdenv.darwin: bootstrap darwin using updated tools #295558
• freshBootstrapTools: remove overlay, prune tools, use tar.xz archive #295557

I can confirm x64 and aarch64 stdenv build with my changes which i am aiming to get in for the next staging cycle.