[2.5.x] [imp] End of Support Notification Plugin.

siehe: https://github.com/joomla/joomla-cms/commit/6a41adb59ddf3614f3e40c66c83f496a6616169e

und: https://github.com/joomla/joomla-cms/commit/9732621cf5d03a8e0f5714414621b87d39e4f503