vineyard: fix test on Linux

[lukeshingles]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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Test on Linux was broken by #181351 (cannot find -lomp since llvm updated to 19.1.0)

[carlocab]

Also, note: since there is no Linux bottle (because the test failed when rebuilding it for llvm@18), CI will not show ❌ if there are failures on Linux. You'll need to open up the log to check if your changes worked.

[lukeshingles]

Ok, this seems ready to me. I removed the compiler overrides associated with this comment “macos AppleClang doesn't support -fopenmp”. Actually, Apple clang can use -fopenmp when libomp.rb is installed, but that wasn’t necessary here because the vineyard build only enables openmp on Linux.

[carlocab]

Thanks; great work!

[github-actions]

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