Android: Avoid interfering with common pre-existing toolchain files
Commonly used Android toolchain files that pre-date CMake upstream support may need to be updated to work with our new functionality. They typically set CMAKE_SYSTEM_VERSION to 1, so detect that and skip our upstream Android settings. When such toolchain files are updated to account for our upstream support, they can then set CMAKE_SYSTEM_VERSION to a valid Android API and get new behavior.
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