Describe the bug

libSystem used to build packages is highly outdated.

To Reproduce

Build any package that is trying to call futimens function on macOS, for example Zig 0.6.

Expected behavior

Such package should build.

Additional context

Apple published code for libraries for macOS up to 10.15.1 - https://opensource.apple.com

Notify maintainers

There is no meta.maintainers but @volth was last one that touched that file.

Metadata

• system: "x86_64-darwin"
• host os: Darwin 18.7.0, macOS 10.14.6
• multi-user?: no
• sandbox: no
• version: nix-env (Nix) 2.3.4
• channels(hauleth): "darwin, nixpkgs-20.09pre221814.10100a97c89"
• nixpkgs: /Users/hauleth/.nix-defexpr/channels/nixpkgs