impossible to report bugs against Ogg Vorbis 1.0
The version fields for libao, Ogg, Vorbis, Vorbis Tools and Vorbis Tools for
Windows don't contain the latest version number (0.8.3, 1.0, 1.0, 1.0 and
1.0), forcing users to use "unspecified" as the version number, e.g. in bugs
#247 and #248.