This reverts commit 69ae372b51 which
removes support for building the Mac version of Bitcoin with UPnP
support and UPnP disabled by default (which should be the default,
according to the community vote and as its the default on all
other platforms).
This should allow the bitcoin binaries to run on ever so slightly more installs,
specifically those who use a different libpng library (many distros use 1.4 which is imcompatible with 1.2.
Thanks joepie91 for the translation of the new copyright notices into Dutch.
Thanks sipa for the translation of the new copyright notices into French.
Thanks megu for the translation of the new copyright notices into Spanish.
Thanks justmoon/Blitzboom for the translation of the new copyright notices into German.
Thanks Joozero for the translation of the new copyright notices into Italian.
Remaining translations were provided by Google Translate.