libogg2's bitpackers cannot be init. due to missing structs
In order to call oggpack_writeinit or oggpack_readinit you need to pass a oggpack_buffer, just
as you have to pass ogg_page and ogg_packet objects to other functions, however the
structure for oggpack_buffer has been removed from ogg2/ogg.h (only in ogginternal.h).
This needs to be fixed before any further work can go into py-ogg2 or libwrit.