patch 9.0.1682: sodium encryption is not portable

patch 9.0.1682: sodium encryption is not portable

Problem: crypt: sodium encryption is not portable
Solution: use little-endian byte order for sodium encrypted files

As mentioned in #12586, sodium encryption only works on little ending
architectures, because reading and writing the sodium encryption
parameters are stored in the encrypted files in an arch-dependent way.

This of course fails for big-endian architectures like s390.

So make sure to use little-endian byte order when reading and writing
sodium encrypted files.

fixes: #12586
closes: 12655