configure.ac: Detect the correct libvorbis library.
configure.ac: Detect the correct libvorbis library.

We actually use libvorbisfile in the vorbis extractor.

hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker