bug#22883: Trustable "guix pull"

[Leo Famulari]

On Sun, Jun 05, 2016 at 09:51:45AM +0200, Werner Koch wrote:
> Given that Guix is a new distro you should really try to get rid of 1.4
> and only use 2.1.  For Windows we use the name "gpg" for a long time now
> and there is a configure option --enable-gpg2-is-gpg to make it easier.

If a Guix user installs GnuPG without specifying the version, which I
think is the typical behavior, they will get the latest version that we
package (currently 2.1.12). That's not exactly what you are requesting,
but it should steer some users towards the modern branch :)

For your reference, we package the classic, stable, and modern branches.