bug#50285: 28.0.50; Mew dosen't work correctly if .el files of Mew are native compiled

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 50285@debbugs.gnu.org
> Date: Mon, 30 Aug 2021 17:02:08 -0400
> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> So we really have 3 problems here:
> 
> 1- The code in Mew should not rely on the makefile rule for
>    correct compilation.
>    Fixing this would also make it easier to distribute Mew via ELPA
>    (where a similar problem shows up since package.el will compile the
>    .el files in an unspecified order which could thus result in the
>    same kind of miscompilation).
> 
> 2- The generation of the `.eln` file should start from the `.elc` file
>    rather than from the `.el` file because we sometimes lack the
>    information needed to correctly re-generate the `.elc` file from the
>    `.el` file.

And 3?...