uutils-coreutils: add feat_os_unix_musl for musl targets.

[apt-install-coffee]

Building on musl targets is supported on uutils-coreutils, using the "feat_os_unix_musl" feature, adding it to makeFlags fixes an issue causing uutils build failure on musl targets.

This does not fix existing issues (#355788 and #355803 ) which prevent cross-compiling this package, only the package-specific musl compilation issue.

Things done

• add 'feat_os_unix_musl' feature for musl targets, allows package to compile for musl targets.

• Built on platform(s)

  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
  • aarch64-multiplatform-musl
  • musl64

• 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/)

• 24.11 Release Notes (or backporting 23.11 and 24.05 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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