Merge topic 'fujitsu-clang-findbinutils' into release-3.21

6ce97c2248 FujitsuClang: Change LTO option from -flto=thin to -flto
3a0effcd16 FujitsuClang: Set CMAKE_<LANG>_COMPILER_AR and CMAKE_<LANG>_COMPILER_RANLIB

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6281