python/venv support broken

[afterthought]

Ref: #2210

I'm posting this as a new issue so it's not lost on a closed PR. This is holding back plz adoption on our team.

@Tatskaari, I tested this and it doesn't quite work. Only 1 pip_library gets linked to python/venv and then the remaining ones are skipped because this line is checking if the destination exists and it does already after the first lib creates python/venv.

[afterthought]

I've started looking at this more. It might be OS specific. I'm seeing the issue on Debian. However, I tested inside the official please ubuntu image and it seems to work correctly here.

[afterthought]

No one has looked at my fork yet. I'm going to create a PR I guess. Hopefully it's not too far off base.

[stale]

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