Add tests for loading native libraries in various locations through am: 6d1693115f

Original change: https://android-review.googlesource.com/c/platform/art/+/2309274

Change-Id: I8bc4d3c44e70e1c94b4f592472ffe1f577f2a2c5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>