How to prevent Engine to load a library

I’ve implemented my own modified version of the CEF plugin, but when I run my game I get:

objc[25555]: Class CefBrowserHostView is implemented in both
/Users/Shared/UnrealEngine/UE_4.15/Engine/Binaries/ThirdParty/CEF3/Mac/Chromium Embedded Framework.framework/Chromium Embedded Framework (0x1202dd668)
and
/Project/LocalGit/Client/Plugins/MyCEF/Shipping/Mac/lib/Chromium Embedded Framework.framework/Chromium Embedded Framework (0x179196d00).
One of the two will be used. Which one is undefined.

I tried to add this to the ini to prevent UE4’s CEF inclusion with no result:

[/Script/BuildSettings.BuildSettings]
bCompileCEF3=False

Tried also to add this to my target rules:

public override void SetupGlobalEnvironment(TargetInfo Target, ref LinkEnvironmentConfiguration OutLinkEnvironmentConfiguration, ref CPPEnvironmentConfiguration OutCPPEnvironmentConfiguration)
{
          UEBuildConfiguration.bCompileCEF3 = false;
}

And “bUsesCEF3 = false;” in my target constructor.
Also changed WITH_CEF in my Preprocessor Macros to 0, but still I get that message.

How can I exclude the library from loading with the engine?

Thank you!