zipOpen2 and unzOpen2 currently cast a zlib_filefunc_def* to mz_stream_vtbl*
Since those structs contain different functions with different parameters in a different order, this will crash the calling application at best and corrupt data (unzOpen2 actually calling into a function that opens the file for writing) at worst.

The functions should either be implemented in a compatible way, or at least removed so users don't think this is going to work before actually running into something that calls the functions.