Bump libdvdread and libdvdnav to the current git master (version 5.0.0 "pre").

Miscellaneous bugfixes and enhancements.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@6004 b64f7644-9d1e-0410-96f1-a4d463321fa5