Comment 6 for bug 190913

Since the "GPLv2 or later" is significantly different than just dual-licensing under the GPLv2 and GPLv3, we should add it. I think the name should be "GPLv2 or later" instead of "GPLv2+" for clarity.

http://www.fsf.org/licensing/licenses/gpl-faq.html#v2OrLaterPatentLicense