[test-suite] Fix OpenBSD build

• Some fixes or workarounds (JM) for not having sys/timeb.h / ftime().
• Use rusage() in minisat.
• Use termios in office-ispell.
• Don't try to use memalign() in oourafft.
• For 2005-05-11-Popcount-ffs-fls, OpenBSD does not have ffsl() yet.

Reviewed By: dim

Differential Revision: https://reviews.llvm.org/D146373