[restored issue] - Add detection of seq/mt version of openblas
OpenBlas library is delivered as libopenblas.so whatever the version, serial/pthread/openmp.
Add a detection, the same way as we do for Intel MKL, detecting sequential/multithreaded version of openblas and set the proper cmake variables and targets i.e. LAPACK_SEQ_LIBRARIES/LAPACK_MT_LIBRARIES.
Warning: this issue has been restored from backup and can have been changed. For example, all comments have been lost.