libdvdread/libdvdnav: Update internal copy of libdvdnav and libdvdread to upstream r1215, current as of 7/30/2010. Incorporates many fixes for memory leaks, segfaults, some new functionality in the API, and support for BUP (Backup IFO) files in damaged DVD structures. Tested against a few dozen DVDs here at home with no obvious issues, will likely infoneed some of the DVD tickets to see if this resync helps.