Exporting a proyect doesn't add the tbloader library

[somebody1121]

On export, Godot complains about not finding a suitable library. Changing on tbloader.gdextension windows.64 to windows.x86_64 make it work. The same applies on the Linux library. I don't know how it works on the mac side but i suspect that a similar change it's necessary. Tested on beta 8. The rest appears to work.