Fix posix_memalign symbol not found with Android API 16 (#953)
Summary: According to this https://github.com/android-ndk/ndk/issues/647, posix_memalign may not exist on Android API 16. From Android NDK r17c, the API exists for Android API 17+. ``` #if __ANDROID_API__ >= 17 int posix_memalign(void** __memptr, size_t __alignment, size_t __size) __INTRODUCED_IN(17); #endif /* __ANDROID_API__ >= 17 */ ``` Change the code to use posix_memalign only after Android API 17+. This would also fix issue for OSS React Native to pack latest folly and building with clang. See: https://github.com/facebook/react-native/issues/20302 and https://github.com/facebook/react-native/issues/20342 Pull Request resolved: https://github.com/facebook/folly/pull/953 Reviewed By: yfeldblum Differential Revision: D10469757 Pulled By: Orvid fbshipit-source-id: c63838f3f6e723ef3de77187f39597a4063043db
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