bug#45012: 27.1.50; Emacs 27.1 release archive missing emacs-module.h

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Wed, 2 Dec 2020 19:11:44 +0100
> Cc: 45012@debbugs.gnu.org
> 
> >   commit 1043cd30acffcc0b61da4a80dcf3f8a5ac459267
> >   Author:     Paul Eggert <eggert@cs.ucla.edu>
> >   AuthorDate: Sat Jun 8 14:08:05 2019 -0700
> >   Commit:     Paul Eggert <eggert@cs.ucla.edu>
> >   CommitDate: Sat Jun 8 14:42:10 2019 -0700
> >
> >       Fix out-of-source make-dist problems
> >
> >       Problem with jisx2131-filter reported by Phillip Lord in:
> >       https://lists.gnu.org/r/emacs-devel/2019-06/msg00147.html
> >       * admin/charsets/Makefile.in (SED_SCRIPT):
> >       Put it in $(srcdir), which is not necessarily the working directory.
> >       ($(SED_SCRIPT)): Rename from jisx2131-filter.  All uses changed.
> >       (clean): Do not remove SED_SCRIPT.
> >       (extraclean): Remove it here instead.
> >       * make-dist (possibly_non_vc_files): Remove src/emacs-module.h.
> >       Although it is portable and could be distributed in the tarball,
> >       it's too much hassle to do that, so let each builder make it.
> >
> > Wasn't there some discussion about the problems with distributing it,
> > as it is not entirely portable?
> 
> If so, then we need to fix that. emacs-module.h must be 100% portable.

Why is it a problem that emacs-module.h is built as part of Emacs?