[Libguestfs] Long running nbdkit tests

[Richard W.M. Jones]

I pushed these two patches which together reduce the build time in
Koji from 7 hours down to 2 hours - almost all of that spent on the
armv7 builder, the other architectures take only a few minutes.

https://github.com/libguestfs/nbdkit/commit/fdbd0ef69f0c222d0cdc35d3c48297aff549abce
https://github.com/libguestfs/nbdkit/commit/ce8357a883167b75ced16ea9f1488f7933b3e813

Rich.

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