Complete Ubuntu compile of GnuPG

[Phil Pennock]

On 2017-11-22 at 08:09 -0500, murphy wrote:
> pinentry-program /usr/bin/pinentry-gtk-2
> 
> This is required since pinentry is not compiled from source but
> installed as an Ubuntu package.

GnuPG's configure takes --with-pinentry-pgm=... to override the default.

(I build the https://public-packages.pennock.tech/ packages (Xenial,
Trusty, Jessie, Stretch; amd64; all installing into /opt/gnupg) using
Vagrant on macOS, VirtualBox driver.  The repos are maintained with
aptly.)

-Phil