Unused dll included in apk when building game with empty screen

I am using Unity3d 5.2. I create an empty project with empty screen (no camera, no script at all). I have no assets, no scripts and set the build stripping level to "Use micro mscorlib". When I look into the apk file, there is bunch of dll that is not referenced. The editor log reveals:

Mono dependencies included in the build
Dependency assembly - Mono.Security.dll
Dependency assembly - System.Core.dll
Dependency assembly - System.dll
Dependency assembly - mscorlib.dll
Dependency assembly - UnityEngine.UI.dll
Dependency assembly - UnityEngine.Networking.dll

According to documents:

Why are there libraries such Mono.Security, UnityEngine.UI, UnityEnigne.Networking in the final build?

 

I think the documentation hasn't been updated in some time (to include the new UI and Networking DLLs). these seem to be included by default, even if they are not used..

 

@liortal do you know how to get rid of them from the post build?

 

I don't think you can currently get rid of them. They don't consume that much space anyway ...