http://cvs.sourceforge.net/viewcvs.py/modplug-xmms/modplugxmms/COPYING?rev=1.1.1.1&view=auto says it for modplugxmms: "ModPlug-XMMS and libmodplug are now in the public domain."
Sorry, but GPL-2 does not allow retro-actively changing the license of existing releases, even if that new license is less restrictive. What you're showing here is a CVS commit, meaning that the next release from upstream will be under a new license. When that time comes, we'll update LICENSE in that new ebuild only, not in the old ones. Closing this bug, it is invalid. Thanks for reporting, though.