Make the glfw source to a submodule?

Hello,

Just want to check if you could make the glfw/ source a submodule, so, it gets easier to track with the origin.

Thanks

Inspect the repository's glfw/ source directory and the existing dependency or build configuration. Check how the current source is tracked against its origin and determine the repository changes needed for a submodule. Done means glfw/ is tracked as the intended upstream submodule and the bindings remain usable.

Written by the indexing model from the issue text.