The path Tools/wpe/cog that contains the external checkout of cog appears as untracked files on my WebKit checkout when doing git status, it is a bit annoying

$ git status
On branch main
Your branch is up to date with 'origin/main'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
	Tools/wpe/cog/

nothing added to commit but untracked files present (use "git add" to track)



Let's add it to .gitignore