Allow LOCAL_ADDITIONAL_DEPENDENCIES for droiddoc modules.

Change-Id: I568b416efe5ccefac6b5e6e99ddccc23600b1f74
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index 951ae3c..87576dc 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -154,7 +154,7 @@
 
 html_dir_files := $(shell find $(LOCAL_PATH)/$(LOCAL_DROIDDOC_HTML_DIR) -type f)
 
-$(full_target): $(full_src_files) $(droiddoc_templates) $(droiddoc) $(html_dir_files) $(full_java_lib_deps)
+$(full_target): $(full_src_files) $(droiddoc_templates) $(droiddoc) $(html_dir_files) $(full_java_lib_deps) $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	@echo Docs droiddoc: $(PRIVATE_OUT_DIR)
 	$(hide) mkdir -p $(dir $(full_target))
 	$(call prepare-doc-source-list,$(PRIVATE_SRC_LIST_FILE),$(PRIVATE_JAVA_FILES), \