That is, any library referred to in GDNative library resources, won't be copied to the export target path unless its path begins with `res://`.
The case use for this is a bit advanced: having a GDN library that will be deployed separately from the project; for instance, to a path in the system (like `/opt/...`).
Currently the GDN library editor doesn't allow to pick dynamic libraries outside the project, but that can be done by editing the `.gdnlib` file manually.
57b2b275b4