Build API stubs instead of implementation jars for i18n and Conscrypt am: 80ae94ad4a am: f830617b0e

Original change: https://android-review.googlesource.com/c/platform/art/+/2102196

Change-Id: I4760aca26b8554a12686bcbaeb82e8389168021b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>