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fix nix build on darwin

Benjamin Lee requested to merge benjamin/cargo-plugin-runner:fix-darwin-build into main

The libc crate links against System and libiconv on darwin. Libc is included as a transitive dependency: clap -> atty -> libc. Confirmed that the build used to work in da26309f, but I haven't actually bisected for the commit that broke it. I'm guessing that an update to one of the flake dependencies changed the available libraries?

The build failure looks like this:

...
       >   = note: ld: library not found for -liconv
       >           clang-11: error: linker command failed with exit code 1 (use -v to see invocation)
       >
       >
       > error: could not compile `cargo_plugin_runner` due to previous error
       For full logs, run 'nix log /nix/store/04mkalaa07j2g7dkl0ybwz3rkiqr5m92-cargo_plugin_runner-0.1.0.drv'

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