[automerger skipped] Get rid of obsolete Make variable TARGET_CORE_JARS. am: c34e3ab270 -s ours

am skip reason: Change-Id I95f9d3abe34df93d486fdc2a5fc65d3013e75a86 with SHA-1 e04fcf67f1 is in history

Change-Id: I1e252eb292a00b29e43522fbf39b4cde9188759b