bug#62762: 'make' often errors with "Org version mismatch" after pulling a new version of the code

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: dmitry@gutov.dev, bzg@gnu.org, 62762@debbugs.gnu.org
> Date: Thu, 13 Apr 2023 14:20:05 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > I think ELisp variable is better, since environment variables are
> > inherited by sub-processes in ways that are hard to control.
> 
> See the attached.
> On Emacs side, `org--built-in-p' will need to be set during compilation.

LGTM, will soon incorporate this in our build system.

Thanks!