Android: Port superbuild to CMake 3.7 capabilities
CMake 3.7 adds support for cross-compiling to Android without a complex toolchain file. Port our Android superbuild script to work without the `android.toolchain.cmake` file. Since CMake 3.7 now detects a lot of information about the target platform up front we need to use a fresh build tree for each API/ABI combination.
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