removed openmp flags as they were not used, and are not supported by all compilers
removed openmp flags as they were not used, and are not supported by all compilers

zasdfgbnm/qutip,qutip/qutip,cgranade/qutip,anubhavvardhan/qutip,cgranade/qutip,qutip/qutip,zasdfgbnm/qutip,anubhavvardhan/qutip