Add optional tags to dalvik.

Change-Id: I29a78ccb6312d12b3ef0ed02cfbc638a5b01db9c
diff --git a/dexopt/Android.mk b/dexopt/Android.mk
index 96ec3b2..3bb98a5 100644
--- a/dexopt/Android.mk
+++ b/dexopt/Android.mk
@@ -43,6 +43,7 @@
 LOCAL_SRC_FILES := $(local_src_files)
 LOCAL_C_INCLUDES := $(local_c_includes)
 LOCAL_SHARED_LIBRARIES := $(local_shared_libraries) libcutils libexpat liblog libnativehelper libutils libz
+LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := dexopt
 include $(BUILD_EXECUTABLE)
 
@@ -54,6 +55,7 @@
     LOCAL_STATIC_LIBRARIES :=  libcutils libexpat liblog libnativehelper libutils libz
     LOCAL_LDLIBS += -ldl -lpthread
     LOCAL_CFLAGS += -DANDROID_SMP=1
+    LOCAL_MODULE_TAGS := optional
     LOCAL_MODULE := dexopt
     include $(BUILD_HOST_EXECUTABLE)
 endif