Fix macOS dyld issue related to git and libiconv #3339
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On macOS,
DYLD_LIBRARY_PATHis set but does not include the homebrew version oflibiconvwhich is needed by the homebrew version ofgit(invoked inci/test.shbyassert_no_diff). I do not think that bindgen sets this variable in its Github Actions test harness, so pressumably this is set by the runner image on macOS for some reason.A simple fix is to unset it unconditionally regardless of the Runner OS and it appears to fully resolve the problem. I'm not very familiar with the bindgen test setup or GHA runners for macOS so happy to revise the PR.
I checked the issue tracker of the GHA runners repo here https://github.com/actions/runner-images/issues and didn't find anything related to this issue.