GnuPG CVE-2018-12020 and Mutt

[Kevin J. McCarthy]

Hi Mutt Users,

GnuPG just released an important security fix involving injection into
the status-fd channel.  The details are at
<https://lists.gnupg.org/pipermail/gnupg-announce/2018q2/000425.html>.

If you are using the suggested values in contrib/gpg.rc, it should NOT
be necessary to switch to using GPGME (despite what they said in their
email).

Specifically make sure you have "--no-verbose" in $pgp_decode_command,
$pgp_verify_command, and $pgp_decrypt_command.

There are a couple other (non-critical) issues Marcus Brinkmann found
and reported to Mutt.  They are mitigated by the new GnuPG release, and
by fixes in Mutt's stable branch.  I will release a new stable version
in the next couple weeks.

-Kevin
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