This PR enables running yices-mcsat with the thread-safety option.
We run it only with GCC, and not with clang because of the unavailability of thread-local storage.
coverage: 65.098%. remained the same when pulling e6ad0761a579827212069a08dcde181e2b00814d on update-ci into 95f13c6777b9c262dc13aebd908aa52fda0892d2 on master.
This PR enables running yices-mcsat with the thread-safety option. We run it only with GCC, and not with clang because of the unavailability of thread-local storage.