Match LZMA SDK 18.05 API.

  ISzAlloc alloc;

  CXzUnpacker state;

  alloc.Alloc = [](void*, size_t size) { return malloc(size); };

  alloc.Free = [](void*, void* ptr) { return free(ptr); };

  alloc.Alloc = [](ISzAllocPtr, size_t size) { return malloc(size); };

  alloc.Free = [](ISzAllocPtr, void* ptr) { return free(ptr); };

  XzUnpacker_Construct(&state, &alloc);

      dst_remaining += 2 * gnu_debugdata_size_;

    }

    return_val = XzUnpacker_Code(&state, dst->GetPtr(dst_offset), &dst_remaining, &src[src_offset],

                                 &src_remaining, CODER_FINISH_ANY, &status);

                                 &src_remaining, true, CODER_FINISH_ANY, &status);

    src_offset += src_remaining;

    dst_offset += dst_remaining;

  } while (return_val == SZ_OK && status == CODER_STATUS_NOT_FINISHED);