Fix FreeBSD native stdenv again

[rhelmot]

Hey gamers it's ya gal Audrey here with another episode of "we need some CI on this derivation". This episode's sponsor is the nix-community builders, who generously offered to set me up with a machine to make sure this build stays building!

Most of these changes are fallout from splitting freebsd.libc into freebsd.libcMinimal + several other derivations. The rest are simply the march of time, rot and let rot.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
  • x86_64-freebsd
• 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/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 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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[artemist]

Most of the changes seem reasonable, but keep-libc is a weird thing to add with no explanation

[artemist]

Testing on my FreeBSD 14.2 VM, I'm still getting a test failure in diffutils (FAIL: test-time) when trying to build stdenv. I should be using a fairly recent version of our patched lix with sandboxing.