bug#52376: 28.0.90; libdir is missing from native-comp-eln-load-path with GTK3 build

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: Eli Zaretskii <eliz@gnu.org>, 52376@debbugs.gnu.org
> Date: Thu, 09 Dec 2021 17:23:22 +0000
> 
> I suggest to set a breakpoint at pdumper.c:5321 and print 'fndata' to
> see where we do expect to find the installed eln we don't find.

Yes, you should continue stepping through the code to see in which of
the directories does it look for the *.eln files.  It decides on that
according to the place where it found the .pdmp file, see
pdumper_set_emacs_execdir, and then the use of emacs_execdir in
pdumper.c.