I3487634f1ec5bb3b5b60d636b64461d391add35a is causing build breakages in
unbundled builds.
The stubs libs are disabled for unbundled builds, and thus we shouldn't
declare them as dist artifacts.
Bug: 605033
Test: make -j dist ANDROID_BUILDSPEC=vendor/google/build/app_build_spec.mk
Change-Id: I3cd92e2cc6aeb48baf47d37780d8df2aa4756438