Hi,

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

This is because the testsuite does not completely clean up after itself,
leading to files that only exist if the testsuite is run.

Assuming that these files are not useful at runtime, the attached patch
removes these files after the test run.


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


Regards,