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* MSVC: Do not add /W3 to CMAKE_<LANG>_FLAGS by defaultBrad King2019-04-196-0/+26
We do not add default warning flags on other compilers, and having a warning flag in the default flags makes it hard for projects to customize the warning level. They need to use string processing to remove `/W3` from `CMAKE_{C,CXX}_FLAGS`. Therefore we should drop it. However, projects may be using string processing to replace `/W3` with another flag, so we cannot simply drop it. Add a policy to drop it in a compatible way. Fixes: #18317