[Libguestfs] [PATCH nbdkit] Set visibility to default for exported symbols

[Richard W.M. Jones]

Actually another problem with this patch is it silently breaks debug
flags.  They are no longer exported, and because nbdkit ignores debug
flags that don't appear to be present in the plugins they just
silently stop working.  Back to the drawing board on this ...

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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