Oh, sorry about this. The continuous integration machine works well, which covered this bug.
Currently, the linking relationship is: TestCpp~~> cocos_extension_static~~> cocos_curl_static, so TestCpp works well as before.
I should remove LOCAL_STATIC_LIBRARIES := curl_static_prebuilt from samples/TestCpp/proj.android/jni/Android.mk.
And perhaps, should we move libcurl.a from cocos2dx/platform/third_party/ to extensions/network folder? What’s your opinion?