Copy libandroidio.so from the Runtime APEX to /system in ART testing.

Add libandroidio.so to the list of Runtime APEX libraries copied in
/system for testing by the standalone-apex-files Make phony target.

Test: ART chroot-based on-device testing using the master-art branch
Bug: 121117762
Change-Id: I06bde7c7db9e2a7e130f3cad932101d152176f8a
1 file changed