I'm not sure whether FSF commented on VLC, but http://www.fsf.org/news/2010-05-app-store-compliance was a complaint about restrictions imposed by the store's terms of service, not about proprietary system code that must be linked in. http://www.gnu.org/licenses/gpl-faq.html#GPLIncompatibleLibs always made a pragmatic exception about doing that, because many early Unixes shipped with proprietary standard libraries and didn't support dynamic linking at all.