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Brad King authored
Since commit d44c0db0 (clang: setup correct configuration in gnu mode, 2019-02-20, v3.15.0-rc1~41^2~5) our Clang compiler information modules need the `CMAKE_<LANG>_COMPILER_FRONTEND_VARIANT` variable that we compute during compiler detection. However, some existing toolchain files set our internal `CMAKE_<LANG>_COMPILER_ID_RUN` variables and block that detection, but do not set the new frontend variant variable. Help them out by setting `CMAKE_<LANG>_COMPILER_FRONTEND_VARIANT` anyway. Fixes: #19515, #19539
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