Remove Build Dependency on game.gdnlib

[jakyle]

given that this is just a node in the game world, I'm not sure if this should be a hard requirement on building the game or not. after all, within gdnative, you can pick and choose which classes you want to expose.

[macalimlim]

@jakyle The gdnlib file is not a node in the game world. It contains the paths to where the libraries (*.so, *.dll, *.dylib, etc.) are located within your project. It's required for running (thru cargo make run) and exporting (thru cargo make export ...). The template has to follow some strict rules where a file should be within a game project, that's why I need to check if this file exist within the game project.

[macalimlim]

@jakyle any update regarding this? If there is nothing more to discuss about this issue, I will close this.