[Libguestfs] regression: file does not understand the -S option

[Olaf Hering]

Recently a commit was added to call 'file -zSb' instead of 'file -zb'.

This causes a regression on Leap 15 (but not on Tumbleweed), because
file 5.32 does not understand the -S option.

How can this be fixed properly, to handle both cases either at runtime
or at buildtime?


Thanks,
Olaf
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