make swfdec_url_new_relative() work correctly with ../ urls
make swfdec_url_new_relative() work correctly with ../ urls

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