Josh Essman 14e179398f Updates to support clingo-cffi (#20657) ... * Support clingo when used with cffi Clingo recently merged in a new Python module option based on cffi. Compatibility with this module requires a few changes to spack - it does not automatically convert strings/ints/etc to Symbol and clingo.Symbol.string throws on failure. manually convert str/int to clingo.Symbol types catch stringify exceptions add job for clingo-cffi to Spack CI switch to potassco-vendored wheel for clingo-cffi CI on_unsat argument when cffi (cherry picked from commit 93ed1a410c)		2021-05-21 15:09:08 +02:00
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spack	Updates to support clingo-cffi (#20657)	2021-05-21 15:09:08 +02:00