support autocrypt support in Debian and Ubuntu

[Arsen STASIC]

Dear mutt-users,

if you are a Debian or Ubuntu user and you are interested in enabling autocrypt support in mutt by default please promote one of the following tickets. If there is enough support the package maintainer will probably consider this change request.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=969324
https://bugs.launchpad.net/ubuntu/+source/mutt/+bug/1894612

cheers,
-arsen