bibisect-linux-64-24.2 gotchas

[Stephan Bergmann]

Be aware that the Linux bibisect repo 
<https://wiki.documentfoundation.org/QA/Bibisect/Linux#bibisect-linux-64-24.2> 
apparently changed its configuration midway at

> commit 8df817ae65e9ef94ae056abdf24d3c864e6077d0 (HEAD)
> Author: Jenkins Build User <tdf at maggie.tdf>
> Date:   Tue Oct 3 11:37:10 2023 +0200
> 
>     source sha:1eef07805021b7ca26a1a8894809b6d995747ba1
>     
>     source sha:1eef07805021b7ca26a1a8894809b6d995747ba1

It dropped the bundled python (with PyUNO support) from instdir (and 
started to support skia).

I now got funny claims that bibisecting allegedly showed that my 
<https://git.libreoffice.org/core/+/1eef07805021b7ca26a1a8894809b6d995747ba1%5E!/> 
"Bump baseline to C++20" started to break Python-related stuff (see the 
comments starting at 
<https://gerrit.libreoffice.org/c/core/+/155121/10#message-f8c7de0591d9e8f6a8abb1029fec9ce32fab460f> 
"Bump baseline to C++20").