compatibility fix for modern CMake versions

[cccfire]

Modern CMake versions have removed compatibility with projects marked with CMake versions <3.5, which affects some of the dependencies in this project and results in an error.

This PR adds the configuration flag -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to the build for x64 windows. The same fix should work for other systems, should they run into this issue, but this is the only environment I have access to at the moment and can confirm the fix with.

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