New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/25586#discussion_r505129103

Comment:
This was an attempt to stop `setuptools` from fetching dependencies at build time (see https://travis-ci.org/github/void-linux/void-packages/jobs/735601759#L570), but I missed the bad versioning in the `egg-info`. When you drop this patch, please replace the `python3-setuptools` in `hostmakedepends` with `python3-setuptools_scm`, which I added to address this problem. (That package depends on `python3-setuptools`.)

Also, it's a good idea to check whether `${wrksrc}/.eggs` exists after `xbps-src build` and, if so, what its contents are. These are eggs fetched by `setuptools` during build. This is bad, because it diminishes reproducibility, makes the build process more fragile, and is deprecated.

A couple of packages that use `setuptools_scm` also use `setuptools_scm_git_archive`, which doesn't seem to be useful in versioning. That can probably be patched out without breaking the package; see [`srcpkgs/python3-Cheroot/template`](https://github.com/void-linux/void-packages/tree/master/srcpkgs/python3-Cheroot/template).