No views relationship for taxonomy's queues

Problem/Motivation

You have an entity queue of taxonomy terms and you want to list them in a page but you cannot reference them in a view of type "taxonomy term", like you do with nodes.

Steps to reproduce

- Create a vocabulary "Product types"
- Create some term inside
- Install entityqueue
- Go to admin/structure/entityqueue and add a new queue
- Choose Simple queue > Entity settings > Taxonomy term > check out "Product types"
- Open the queue and add some term

Now create the view to show the terms

- Go to views then add a new one
- Choose "Show > Taxonomy terms" in View Settings
- Like you do with nodes, go to Advanced (panel on the right) and try to add a relationship
- You cannot see any option about queues...