Merge topic 'revert-CheckCompilerFlag-clang-argument-unused' into release-3.26

97fcd3bd30 CheckCompilerFlag: Revert 'Match the Clang "argument unused" output ...'

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Acked-by: scivision <michael@scivision.dev>
Merge-request: !8322