New review comment by mhmdanas on void-packages repository

https://github.com/void-linux/void-packages/pull/42439#discussion_r1122892294

Comment:
It's kind of the new (semi-)official convention to avoid using any variables other than `version` (or related variables) in `distfiles`. For example, see the commit description in https://git.vuxu.org/xtools/commit/?id=248be132dff32a1d2ec45dce0c84f878fe8fdc51:

> It also often doesn't save any characters and not using the variable
> makes prettier, simpler URLs that can often be copied from the template
> without manually replacing variables to get to the page with sources.

The commit message is referring to `${pkgname}`, but the same idea applies to `${homepage}` too.