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Brad King authored
Define a `CMAKE_WINDOWS_KITS_10_DIR` environment variable to allow users to tell CMake about a custom Windows 10 SDK directory. We choose to make this an environment variable rather than a CMake variable or cache entry because: * Using a custom directory also requires custom external MSBuild configuration. Therefore users are already configuring a custom environment. * The custom directory must be set consistently in all parts of a build including nested projects. An environment variable avoids requiring users to thread the setting into nested builds. Fixes: #16743
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