bug#50955: 28.0.50; info-look loads slowly due to python info lookup

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Hugo Nobrega <hugonobrega@dcc.ufrj.br>,  50955@debbugs.gnu.org
> Date: Sun, 03 Oct 2021 10:54:57 +0200
> 
> I think perhaps we should revert 711eb40b9b on the emacs-28 branch, and
> then extend info-look on master to add new functionality to allow
> postponing the computation of stuff until run-time, so we only compute
> the paths for the package that requires it.  That is, if we're looking
> for python-mode info, then compute that when the user asks for it.

Fine with me.