Add platform libraries required for ART chroot testing.

Those libraries are not in an APEX, and are provided as stubs
in the platform-mainline-sdk. Therefore compile them explicitly and make
them available in the dist directory.

Test: scripts/build-mainline-modules.sh
Bug: 142935992
Change-Id: I919d8c580e907ce9a7b54366653d0c63ab9d00c7