Make sure ApiLevelChecker is ready for AndroidX migration
Make sure ApiLevelChecker is ready for AndroidX migration

Summary: Accept the old or the new version of the support library. Here are the docs for androidx's RequiresApi: https://developer.android.com/reference/androidx/annotation/RequiresApi

Reviewed By: wsanville

Differential Revision: D14060095

fbshipit-source-id: 71063fe03a3f972f33f79bf81afbdaf55e101d47

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