bump the libversion
bump the libversion

this should have been in 0.5.1 already. If you're a packager, please include this.

freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,mltframework/swfdec,mltframework/swfdec