cocos2dx 自己主动加入cpp文件到android.mk

将

LOCAL_SRC_FILES := hellocpp/main.cpp 
                   ../../Classes/AppDelegate.cpp 
                   ../../Classes/HelloWorldScene.cpp

改动成

FILE_LIST := hellocpp/main.cpp  
FILE_LIST += $(wildcard $(LOCAL_PATH)/../../Classes/*.cpp)  
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)