Function mp4parse_capi::mp4parse_is_fragmented

#[no_mangle]
pub unsafe extern fn mp4parse_is_fragmented(parser: *mut mp4parse_parser,
                                            track_id: u32,
                                            fragmented: *mut u8)
                                            -> mp4parse_error

A fragmented file needs mvex table and contains no data in stts, stsc, and stco boxes.