-DCMAKE_INSTALL_UCRT_LIBRARIES=ON silently fails if installed Windows 10 SDK does not contain UCRT DLLs

LLVM now uses include(InstallRequiredSystemLibraries) with -DCMAKE_INSTALL_UCRT_LIBRARIES=ON to package UCRT DLLs for use on down-level platforms. Unfortunately, if the build machine does not have a sufficiently recent Windows 10 SDK (which includes the /Redist/ucrt/DLLs folder), CMAKE build silently ignores this problem and "succeeds" without including the required files.

It should emit an error, or at least a warning.

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