Make art use core-libart explicitly

Change-Id: Ibc75910df56428dd8d5d2a4bab41dc3d2a3c61d7
diff --git a/build/Android.oat.mk b/build/Android.oat.mk
index 2daf5d0..05f15e7 100644
--- a/build/Android.oat.mk
+++ b/build/Android.oat.mk
@@ -39,7 +39,7 @@
 
 ########################################################################
 # A smaller libcore only oat file
-TARGET_CORE_JARS := core conscrypt okhttp core-junit bouncycastle
+TARGET_CORE_JARS := core-libart conscrypt okhttp core-junit bouncycastle
 HOST_CORE_JARS := $(addsuffix -hostdex,$(TARGET_CORE_JARS))
 
 HOST_CORE_DEX_LOCATIONS   := $(foreach jar,$(HOST_CORE_JARS),  $(HOST_OUT_JAVA_LIBRARIES)/$(jar).jar)