libxul 1.9.2 update coming

beat and me are currently preparing for the update of www/libxul to 1.9.2.8. This also includes cleanup of old gecko providers in a lot of other ports and fixes numerous security relevant problems in libxul.

We spend some time fixing ports that do not correctly build with that new version and marked mplayer-plugin as deprecated because it just does not build with libxul 1.9.2 and is discontinued from upstream. As a replacement you should use gecko-mediaplayer.