Merge topic 'refactor-compile-features-and-flags'

588371d2d5 Modules: Rename CMakeDetermine{CompileFeatures -> CompilerSupport}
4d27ef55bd Modules: Factor out helpers for GNU language standard flags

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !9366