bug#4446: remove ###autoload from ediff-hook.el

[Dan Nicolaescu]

Stefan Monnier <monnier@IRO.UMontreal.CA> writes:

  > >> Luckily, ldefs-boot.el saves the day:  Tada!
  > > Huh, for some reason I thought ldefs-boot wasn't used anymore during
  > > bootstrap, but it is. I thought this was therefore going to be
  > > straightforward, but because loadup.el sets purify-flag nil in
  > > bootstrap-emacs, when the autoloads are made, preloaded-file-list only
  > > contains loadup.el.
  > 
  > BTW, the list of preloaded files is already encoded in src/Makefile.in.
  > Or you could otherwise extract it statically with something like
  > 
  >    sed -n -e 's/.*(load "\(.*\)".*/\1/p' lisp/loadup.el

This fails, it won't generate autoloads for emacs-lisp/easymenu.el, and
those autoloads are needed.