fix: Don't error when passing too new warning flags to old clang. - #270

✔️ Validator: TITLE

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  Input : fix: Don't error when passing too new warning flags to old clang.
  Settings : {"or":[{"must_include":{"regex":"^(feat|docs|chore|cleanup|fix|refactor|test|style|perf)(\\([^) ]+\\))?:\\ .+$","message":"Semantic release conventions must be followed."}},{"must_include":{"regex":"^Bump [^ ]* from [^ ]* to [^ ]*$","message":"Dependabot PRs are exempt from semantic release conventions."}}]}

✔️ Validator: COMMIT

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  Input : fix: Don't error when passing too new warning flags to old clang.

Older macOS versions with older xcode versions with older clang versions
don't have these warning flags. On newer ones, we do need those
suppressions. Alternative would be to detect support, but in this case,
we don't really care to be extremely clean.
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✔️ Validator: DESCRIPTION

• ✔️ description must exclude '\[ \]'
  Input : Older macOS versions with older xcode versions with older clang versions don't have these warning flags. On newer ones, we do need those suppressions. Alternative would be to detect support, but in this case, we don't really care to be extremely clean.

This change is 

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