Check for minimum required Windows version

[thbeu]

Resolves #2191.

[yhirose]

@sum01 @jimmy-park could you please review this pull request for me? Thanks!

[sum01]

My first thought is to use CMAKE_SYSTEM_VERSION instead.

With CMAKE_HOST_SYSTEM_VERSION if you cross-compile it could fail if the build system version returns < 10, regardless of if you're on Windows or not.

Maybe you have other thoughts though?

[thbeu]

My first thought is to use CMAKE_SYSTEM_VERSION instead.

Sure. I changed it accordingly.

[yhirose]

Thanks for making the improvement!