Hi,

Whilst working on the Reproducible Builds effort [0], we noticed that
libslow5lib could not be built reproducibly.

This is because the testsuite generates some (temporary?) files that
are not cleaned up and end up in the binary packge, meaning that if
the tests are skipped the package will be "missing" those files and
will be unreproducible.

Patch attached.

 [0] https://reproducible-builds.org/


Regards,