Fix failure to load split ZIM archives

[Jaifroid]

As mentioned in kiwix/kiwix-js#934, an error is thrown when attempting to load split ZIM archives in the wasm build. Mossroy had also mentioned this somewhere.

It would be great to have any thoughts on whether this issue is inherent in the parts of libzim that have been exposed here, or whether it has something to do with the way in which the archives parts are being presented to the WASM. The issue may well be in the wrapper code. Who might have some insight into this?

[Jaifroid]

Some more debug info, attempting to load a Wikivoyage ZIM split into multiple pieces:

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be now be reviewed manually. Thank you for your contributions.

[Jaifroid]

It's worth monitoring and testing openzim/libzim#879 to see if it might fix this issue.