According to https://developer.android.com/ndk/guides/abis.html#x86
Android always support SSE, so there's no need to test SSE OS support.
Why both __ANDROID__ and ANDROID are tested:
http://stackoverflow.com/questions/15328751/android-macro-suddenly-not-defined
http://stackoverflow.com/questions/6374523/how-to-detect-compilation-by-android-ndk-in-a-c-c-file
https://groups.google.com/forum/#!topic/android-ndk/cf9_f1SLXls
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