`passsage -c` doesn't work properly on Darwin

First and foremost: I'm not a Darwin person, I'm just forwarding observations since I happen to maintain passage in nixpkgs, so apologies if I missed a few details.

Relevant report and PR: https://github.com/NixOS/nixpkgs/pull/369955, https://github.com/NixOS/nixpkgs/issues/369314

The symptom is that `passage -c` doesn't copy to clipboard on 1.7.4a2. One reason that was brought up in the original PR that introduced this patch in nixpkgs (https://github.com/NixOS/nixpkgs/pull/24797) is that this doesn't work with use of single-binary coreutils. However, the portion in `password-store.sh` got removed and both `passage` and `pass` seem to work with clipboards on Linux, so I'm not sure if that's accurate after a closer look.

I didn't do a closer examination of which parts are actually broken on Darwin, butI figured the patch (https://github.com/NixOS/nixpkgs/pull/24797/files#diff-a55e5373264b1a674b0dc69370337d94c0b53689083342eb3cb172c06756dab7) might still be interesting for you.