Don't delete META-INF carried by the core-tests jar.

Change-Id: Ie80d60712b1471b4c79a66b9a28e04b91322fe9a
diff --git a/tests/core/ctscore.mk b/tests/core/ctscore.mk
index 027d7c1..27ff881 100644
--- a/tests/core/ctscore.mk
+++ b/tests/core/ctscore.mk
@@ -20,5 +20,6 @@
 LOCAL_MODULE_TAGS := optional
 # and when installed explicitly put them in the data partition
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_APPS)
-
+# Don't delete META-INF from the core-tests jar
+LOCAL_DONT_DELETE_JAR_META_INF := true
 include $(BUILD_PACKAGE)