gnupg-1.4 is not developed actively anymore, and new software expects
a modern "gpg" executable, which leads to pointless patches in the ports
tree. Move the various users of security/gnupg2 to security/gnupg and
zap patches that forced the use of "gpg2".
Crusade started by edd@ (security/gnupg maintainer), gnupg->gnupg2 test
reports from semarie@, giovanni@ and solene@, input and bulk build by
sthen@. ok sthen@ edd@ (maintainer)