New review comment by hasufell on void-packages repository

https://github.com/void-linux/void-packages/pull/35624#discussion_r889616575

Comment:
The internal downloader can cause issues with esoteric proxy configurations. In that case users can do

```sh
ghcup config set downloader Curl
```

to set the downloader back to curl, which can handle it. This should be a post-install message as well.