catkin_make fails on `venv_lock` about catkin_virtualenv

[Doomerdinger]

@androiddrew What was the resolution here, if any?

I'm encountering the same issue (Melodic, 18.04). I don't see any PRs or commits that specifically address this.

I encounter the issue when doing a non-isolated build such as with catkin_make, and use catkin_virtualenv in more than one package in my project.
The cause seems pretty clear, this line gets called in more than one of my packages withing the project, both defining a target with the same name and thus it errors out.