New in version 3.7.1.
When Cross Compiling for Android with the NDK, this variable provides the NDK’s “host tag” used to construct the path to prebuilt toolchains that run on the host.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_ANDROID_NDK_TOOLCHAIN_HOST_TAG.html