Build libcore CTS tests as multilib modules.

The CTS runner uses the same APK for both 32 and 64 bit
tests.

bug: 17745770
Change-Id: I4fd5bb061ab937e3bdd39b284844b6584f799437
diff --git a/tests/core/ctscore.mk b/tests/core/ctscore.mk
index 95f4634..fea0b07 100644
--- a/tests/core/ctscore.mk
+++ b/tests/core/ctscore.mk
@@ -25,4 +25,8 @@
 
 LOCAL_JNI_SHARED_LIBRARIES := libjavacoretests
 
+# Include both the 32 and 64 bit versions of libjavacoretests,
+# where applicable.
+LOCAL_MULTILIB := both
+
 include $(BUILD_PACKAGE)