bug#25572: Signatures on Emacs windows .zip files

[Eli Zaretskii <eliz@gnu.org>]

> From: Richard Kettlewell <rjk@terraraq.uk>
> Date: Sun, 29 Jan 2017 11:48:55 +0000
> 
> According to https://www.gnu.org/software/emacs/download.html:
> 
>     Since the 24.5 release, tarballs are signed with the GPG key from
>     Nicolas Petton 7C207910, fingerprint 28D3 BED8 51FD F3AB 57FE
>     F93C 2335 87A4 7C20 7910, which can be found in the GNU keyring.
> 
> However the windows .zip files on http://ftp.gnu.org/gnu/emacs are
> signed with some other key:
> 
> $ gpg2 --verify emacs-25.1-2-x86_64-w64-mingw32.zip.sig
> gpg: Signature made 11/29/16 19:54:09 GMT Standard Time using DSA key ID
> 60C3B396
> gpg: Good signature from "Phillip Lord <phillip.lord@russet.org.uk>"
> gpg:                 aka "Phillip Lord <p.lord@russet.org.uk>"
> gpg:                 aka "Phillip Lord <p.lord@hgmp.mrc.ac.uk>"
> gpg:                 aka "Phillip Lord <phillip.lord@newcastle.ac.uk>"
> gpg: WARNING: This key is not certified with a trusted signature!
> gpg:          There is no indication that the signature belongs to the
> owner.
> Primary key fingerprint: 8352 2404 7598 ECBC 61A1  DA34 5FE9 658D 60C3 B396

That's because the zip files with Windows binaries were produced by
Phillip.

Why is that a bug?