The source from this directory was copied from the vorbis
git repository using the update.sh script. The only changes
made were those applied by update.sh and the addition/update of
Makefile.in and moz.build files for the Mozilla build system.
The upstream version used was vorbis v1.3.5-49-c784057
Some files are renamed during the copy to prevent clashes with object
file names with other Mozilla libraries.