cargo: unset HOST_PKG_CONFIG_PATH

[alyssais]

This is no longer required for the original use case since 83aaf61 ("cargo,clippy,rustc,rustfmt: 1.78.0 -> 1.79.0").

Extracted from #196333, since it no longer depends on any other changes in that PR.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and others READMEs.

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[philiptaron]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 426852 --package cargo --package cargo.passthru.tests
Commit: 1f6f9b0d21b6dd1826de7041508b6594c8cf42fd

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x86_64-linux

✅ 6 packages built:

• cargo
• cargo.passthru.tests.fd
• cargo.passthru.tests.firefox
• cargo.passthru.tests.ripgrep
• cargo.passthru.tests.thunderbird
• cargo.passthru.tests.wezterm