Re: [PR PATCH] [Closed]: python3: update to 3.10.0

[ahesford <ahesford@users.noreply.github.com>]

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

python3: update to 3.10.0
https://github.com/void-linux/void-packages/pull/33097

Description:
[ci skip]
Opening this early to keep track of things. The template currently uses Python 3.10.0rc2. Over the next several days or weeks I will run the entire list through the full build matrix and start chipping away at any issues that arise, then start running my local Python stack on 3.10 to look for any issues. Help is appreciated.

Package list was determined by running several scripts and computing the unique packages:
```zsh
foreach f ($(grep -l pycompile srcpkgs/*/template))
    grep -q python_version=2 $f && continue
    grep -q python_version=3 $f || grep -q python3 $f || continue
    pkg=$(xsubpkg -m $(basename ${f%/template}))
    echo $pkg >> pkgs.combined
end
```

```zsh
(cd srcpkgs && echo python3-* | xargs -n1 realpath -e | xargs -n1 basename | sort | uniq) >> pkgs.combined
```

```zsh
xrevshlib python3 >> pkgs.combined
```

```zsh
xlocate usr/lib/python3 | cut -f1 | sort | uniq | \
    xargs -n1 xbps-uhelper getpkgname | \
    xargs -n1 xsubpkg -m | sort | uniq >> pkgs.combined
```

If you use these scripts, I *highly* recommend parallelizing `xargs`.

I had to modify the regexes in `post-install/04-create-xbps-metadata-scripts.sh` and `pre-pkg/03-rewrite-python-shebnag.sh` to accommodate the extra digit in the "3.10" version string.

The `python3` and `python3-tkinter` templates have been altered to pull `python3` in `hostmakedepends` for cross builds rather than custom-building a host version in `do_build`. Thanks to @q66 for this idea.