cocos2dx3.5 编译andorid要怎么添加iconv的支持库

Cocos2d-x
#1

找了下，ndk自带iconv，在android-ndk-r10d\sources\android\support\include目录下
在Android.mk里添加以下两行无效，请问该怎么编写
LOCAL_WHOLE_STATIC_LIBRARIES += android_support
$(call import-module,android/support)