Bug#959914: Open failed when using encrypted header combined with multipart

[Ski-lleR]

If you use encrypted header (-mhe) when creating the multipart, Xarchiver will 
fail to open the archive like it failed before the patch.

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publickey - ski_ller@protonmail.ch - 0xC8010ECA.asc
Description: application/pgp-keys

signature.asc
Description: OpenPGP digital signature