mkarchiso: use an empty UUID for EROFS
The UUID is never used for anything, since the file system resides in a
file. Instead of generating a reproducible UUID for it, use
00000000-0000-0000-0000-000000000000 instead.
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The UUID is never used for anything, since the file system resides in a
file. Instead of generating a reproducible UUID for it, use
00000000-0000-0000-0000-000000000000 instead.