Do not check a `ln` linked file twice

[nuke-web3]

I need to soft link files in places for compatibility within a project. Sadly mlc will not detect that the file is a "redirect" to another file it is going to check.

Describe the solution you'd like

As a first step, some option for how to handle ln objects - to follow or not.

Ideally I would love for automatic detection of this, so not to duplicate work if the file is going to be checked again, and if it is not, default to check the linked file (once).