Fix clang "unknown warning group" errors #65
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Use clang __has_warning macro to avoid "unknown warning group '-Wsuggest-override'" warning in older versions of clang that have the __has_warning macro but don't have the suggest-override warning. Errors were showing up in https://github.com/bitcoin/bitcoin/pull/10102/checks?check_run_id=4671391974 https://cirrus-ci.com/task/4642955743985664
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Use clang __has_warning macro to avoid
unknown warning group '-Wsuggest-override'warning in older versions of clang that have the__has_warningmacro but don't have thesuggest-overridewarning.Errors were showing up https://github.com/bitcoin/bitcoin/pull/10102/checks?check_run_id=4671391974 / https://cirrus-ci.com/task/4642955743985664