BSE: work around vorbisfile-1.3.4 pcm_seek crashes
BSE: work around vorbisfile-1.3.4 pcm_seek crashes

The crashes can occour for small vorbis files when pcm_seek(_page)
gets close to EOF. To avoid this situation, we force a raw seek to
the file start before attempting a pcm_seek. This effectively
doubles seeking time but avoids crashes in most cases.

GNOME/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,GNOME/beast,GNOME/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,GNOME/beast,swesterfeld/beast,tim-janik/beast,GNOME/beast,swesterfeld/beast,GNOME/beast,GNOME/beast,tim-janik/beast