language/python: remove outdated "homebrew-" resource handling

[Rylan12]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

The homebrew-* resources were used to separate resources needed for virtualenv from those defined in the formula. We don't use virtualenv anymore so there's no need to handle these differently anymore.

[BrewTestBot]

Review period will end on 2021-03-16 at 00:00:00 UTC.

[BrewTestBot]

Review period ended.

[iMichka]

This might have broken the magic-wormhole build on Linux, but it's maybe unrelated:
https://github.com/Homebrew/linuxbrew-core/runs/2119521006

[Rylan12]

It's possible but I don't know where the homebrew-* resource would have come from. Feel free to revert this if you feel it is causing problems, though

Actually, I doubt it's related to this. The only change would be that a homebrew-* resource would be installed, whereas before it was skipped. I don't see anything in the logs that would indicate that was happening (just skimmed, though)

[Bo98]

The problem is because a virtualenv is created twice in that formula. It's not new, but I don't know why it isn't consistent in failing at the moment.