Fixing "cocos-ext.h" not found issue

When using the Cocos2d-extension (e.g ScrollView, Button) on my project, 

I found that it is okay to compile in Xcode but not in Android; 

It said cannot found "cocos-ext.h"

The case is easy because Android.mk in the extension folder is configured wrong;

File location: cocos2d-x/extension/Android.mk

Orignal setting: 

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/.. \

                           $(LOCAL_PATH) \

                           $(LOCAL_PATH)/GUI/CCControlExtension \

                           $(LOCAL_PATH)/GUI/CCScrollView

Correct one should:  $(LOCAL_PATH) is added

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/.. \

                           $(LOCAL_PATH) \

                           $(LOCAL_PATH)/GUI/CCControlExtension \

                           $(LOCAL_PATH)/GUI/CCScrollView