[DVDnav-discuss] Patch to add dvdnav_get_serial_string function to dvdnav

[Matthew Wire]

The attached patch adds a function to dvdnav to obtain the dvd serial
number externally.

This is used in mythtv to generate a unique id for the disc for it's
bookmarking code.

This is my first patch to dvdnav to please tell me if I'm doing things
wrong etc.

Cheers,
Matthew
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