[PATCH] doc: avoid using deprecated sphinx function

[Tom Rini]

On Tue, Nov 14, 2023 at 03:18:02PM +0000, Caleb Connolly wrote:

> The execfile_() function in sphinx has been removed after being
> deprecated for some time. Follow what sphinx upstream does in [1] to
> avoid using this function. This fixes "make htmldocs" on at least Arch
> Linux but likely other distros too.
> 
> [1]: https://github.com/sphinx-doc/sphinx/commit/9ced1e355ad6baecd4e755a598a54877dc0aad44
> 
> Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>
> ---
> base-commit: 92b27528d777ce85362af45e7d2974a6c856219b

I think we should cherry-pick:
commit 0283189e8f3d0917e2ac399688df85211f48447b
Author: Jonathan Corbet <corbet at lwn.net>
Date:   Wed Jan 4 10:47:39 2023 -0700

    docs: Fix the docs build with Sphinx 6.0

from the kernel, to keep the file in-sync. That's the only commit to
load_config.py since I believe we synced last, but there might be other
changes in Documentation/sphinx/ to grab as well.

-- 
Tom
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