Restore -Werror for macOS builds
#342
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I don't see warnings when building Julia on macOS (e.g. see https://buildkite.com/julialang/julia-master/builds/34547), so I think we should restore the
-Werrorflag that was removed in #296 and #297, sounds like the warning mentioned there (without reference, so it's a bit hard to track it) has been since fixed.Edit: ah, the unreferenced warning may have been the one in LLVM mentioned at JuliaLang/julia#49443 (comment), which was fixed by llvm/llvm-project@39d348c.