Build-tested on x86_64 Linux and on Darwin.
Fixes the build. This package is probably ripe for removal by now, as dirmngr was incorporated into gnupg a couple of years ago: https://lists.gnupg.org/pipermail/gnupg-announce/2014q4/000358.html
gnupg tests fail. Will try to fix later. svn path=/nixpkgs/trunk/; revision=21884