pfPorts: Sync unbound 1.4.19 from FreeBSD ports r308903

- Had to disable default ECDSA support. Requires OpenSSL 1.0 either
   via base (unlikely to happen with 8.x) or the ports.

   A previous commit in the ports denoted this with ports/173709,
   and was confirmed to be still valid locally with FreeBSD 8.3.

   Upstream project recommends OpenSSL 1.0 for ECDSA due to issues
   with 0.9.8, see: http://unbound.net/pipermail/unbound-users/2012-May/002386.html

 - 1.4.19 seems to be a regular Bugfix release, nothing security relevant.