bug#72045: Emacs graft lookup still fails

[Liliana Marie Prikler]

Hi Guix,

this got reported in the XMPP chat already, but the basic gist is this:
with the grafting of Emacs 29.3 to 29.4, we see that Emacs itself is
still correctly loaded, but Emacs libraries (e.g. dash) aren't.

(comp-el-to-eln-filename (expand-file-name "…/dash.el"))
=> $HOME/.config/emacs/eln-cache/29.4-46e5bcbe/dash-2.19.1/dash.eln

find $(guix build emacs-dash --with-input=…) -name 'dash.eln'
=> $PREFIX/lib/emacs/native-site-lisp/29.3-62809b9a/dash.eln

It seems that we might have to rebuild emacs native-compiled packages
even if emacs itself is grafted.  Do we have any pointers on how to
correctly process this graft?

Cheers