[automerger skipped] Export libtextclassifier and make some native tests working again am: a06bdc71ed -s ours

am skip reason: Change-Id I98b25793e9644bee43f416255911d969b31d91b7 with SHA-1 d4b52f3f0d is in history

Change-Id: I2a715f92ca176601cec6f6a1730912a823588286