Merge topic 'clang-tidy-export-fixes-dir'

232467eb1c clang-tidy: add <LANG>_CLANG_TIDY_EXPORT_FIXES_DIR property

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !7982