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Replace our hard-coded default for `/RTC1` with a first-class abstraction to select runtime checks from an enumeration of logical names. Add a `MSVC_RUNTIME_CHECKS` target property and corresponding `CMAKE_MSVC_RUNTIME_CHECKS` variable. Removing the old default flag requires a policy because existing projects may rely on string processing to edit them and choose runtime checks under the old behavior. Add policy CMP0184 to provide compatibility. Fixes: #26614