Add LOCAL_DONT_DELETE_JAR_META_INF

To support to not delete META_INF directory from the static Java
libraries.

Change-Id: I720bfa059c43dd457a74a0c60bb6797aa408ecaf
diff --git a/core/java.mk b/core/java.mk
index 0fccbd3..66f9a02 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -259,6 +259,7 @@
 # via deps on the target that generates the sources.
 $(full_classes_compiled_jar): PRIVATE_JAVACFLAGS := $(LOCAL_JAVACFLAGS)
 $(full_classes_compiled_jar): PRIVATE_JAR_EXCLUDE_FILES := $(LOCAL_JAR_EXCLUDE_FILES)
+$(full_classes_compiled_jar): PRIVATE_DONT_DELETE_JAR_META_INF := $(LOCAL_DONT_DELETE_JAR_META_INF)
 $(full_classes_compiled_jar): $(java_sources) $(java_resource_sources) $(full_java_lib_deps) $(jar_manifest_file) \
 	$(RenderScript_file_stamp) $(proto_java_sources_file_stamp)
 	$(transform-java-to-classes.jar)