Add optional tags to ICU.

Change-Id: I65442453cacf4e9b2c620317021445d5bb0ef701
diff --git a/common/Android.mk b/common/Android.mk
index 3f6aa10..0fc0588 100644
--- a/common/Android.mk
+++ b/common/Android.mk
@@ -128,6 +128,7 @@
 LOCAL_C_INCLUDES := $(c_includes)
 LOCAL_CFLAGS := $(local_cflags) -DPIC -fPIC
 LOCAL_LDLIBS += $(local_ldlibs)
+LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := libicuuc
 include $(BUILD_SHARED_LIBRARY)
 
@@ -144,6 +145,7 @@
     LOCAL_CFLAGS := $(local_cflags)
     LOCAL_LDLIBS += $(local_ldlibs)
     LOCAL_ADDITIONAL_DEPENDENCIES += $(HOST_OUT)/usr/icu/$(root).dat
+    LOCAL_MODULE_TAGS := optional
     LOCAL_MODULE := libicuuc
     include $(BUILD_HOST_SHARED_LIBRARY)
 
diff --git a/i18n/Android.mk b/i18n/Android.mk
index e51b993..c70f1ff 100644
--- a/i18n/Android.mk
+++ b/i18n/Android.mk
@@ -96,7 +96,7 @@
 
 LOCAL_SHARED_LIBRARIES += libicuuc
 LOCAL_LDLIBS += -lpthread -lm
-
+LOCAL_MODULE_TAGS := optional
 LOCAL_MODULE := libicui18n
 
 include $(BUILD_SHARED_LIBRARY)
@@ -117,7 +117,7 @@
 
     LOCAL_SHARED_LIBRARIES += libicuuc
     LOCAL_LDLIBS += -lpthread -lm
-
+    LOCAL_MODULE_TAGS := optional
     LOCAL_MODULE := libicui18n
 
     include $(BUILD_HOST_SHARED_LIBRARY)