New in version 3.9.
When Cross Compiling for Android with the NDK, this variable may be set to specify whether to use the deprecated per-api-level headers instead of the unified headers.
If not specified, the default will be false if using a NDK version that provides the unified headers and true otherwise.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_ANDROID_NDK_DEPRECATED_HEADERS.html