cmake COMPILER_RT_HAS_WTHREAD_SAFETY_BETA_FLAG examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/cmake/config-ix.cmake :148

check_cxx_compiler_flag("-Werror -Wthread-safety-beta" COMPILER_RT_HAS_WTHREAD_SAFETY_BETA_FLAG)

CTSRD-CHERI/cheribsd contrib/subrepo-cheri-compiler-rt/cmake/config-ix.cmake :125

check_cxx_compiler_flag("-Werror -Wthread-safety-beta" COMPILER_RT_HAS_WTHREAD_SAFETY_BETA_FLAG)