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FujitsuClang: Fix settings for IPO(LTO)

Yuichiro Utsumi requested to merge yutsumi/cmake:fujitsu-clang-findbinutils into master

To fix the issue that IPO(LTO) fails in FujitsuClang, set the variables CMAKE_<LANG>_COMPILER_AR and CMAKE_<LANG>_COMPILER_RANLIB. And change LTO option from -flto=thin to -flto since -flto=thin is not officially supported.

Fixes: #22337 (closed)
Backport: release

Edited by Brad King

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