Skip build .pdb file

My PC is quite slowly. So when I build a project I dont want Unity build .pdb file, It take more time to do. Even I unchecked “Development Build” Unity still built .pdb file. I built for Window Standalone using Unity 5.3.4.

What I should do? Thanks.
In this thread, Unity said that they have added the feature to not copy PDB files in Unity 5.4
UnityEditor.EditorUserBuildSettings.SetPlatformSettings(“Standalone”, “CopyPDBFiles”, enabled);