Add LOCAL_DX_FLAGS := --multi-dex where it is enabled for jack. Also stop enabling multi-dex when coverge is enabled, since multi-dex is now enalbed unconditionally. Test: builds Change-Id: I67fedcdd5bb5d7091468bddcb0c22bab720a51d2 Merged-In: I67fedcdd5bb5d7091468bddcb0c22bab720a51d2 (cherry picked from commit 17ffa24277380c69bf365fa595e7d4e6e51825eb)