[automerger skipped] Export libtextclassifier and make some native tests working again am: a06bdc71ed -s ours am: 96376c6f9e -s ours am: 5d08aa63a1 -s ours

am skip reason: Change-Id I98b25793e9644bee43f416255911d969b31d91b7 with SHA-1 a06bdc71ed is in history

Change-Id: Id9523ead78eb05bc2d377f89933652bc9cf6ae09