There's a merged pull request on the void-packages repository

rc: fix dead links
https://github.com/void-linux/void-packages/pull/32875

Description:
<!-- Mark items with [x] where applicable -->
`rc` seems pretty dead now. `tobold.org` and `static.tobold.org` are down. I have tried to contact the author, but his email seems to be down too. This package should maybe be removed rather than fixed.

This PR fixes dead links and modifies the build process.

@leahneukirchen I'm pinging you since you are the maintainer of `rc`. Do you have any comment on this?
#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [ ] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [x] I generally don't use the affected packages but briefly tested this PR