cmake COMPILER_RT_HAS_W4_FLAG examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/cmake/config-ix.cmake :155 

check_cxx_compiler_flag(/W4 COMPILER_RT_HAS_W4_FLAG)

trailofbits/polytracker polytracker/src/compiler-rt/cmake/config-ix.cmake :112 

check_cxx_compiler_flag(/W4 COMPILER_RT_HAS_W4_FLAG)

CTSRD-CHERI/cheribsd contrib/subrepo-cheri-compiler-rt/cmake/config-ix.cmake :132 

check_cxx_compiler_flag(/W4 COMPILER_RT_HAS_W4_FLAG)