Patch from Mark Fasheh <mark.fasheh@oracle.com> (plus a few cleanups
and a speedup from yours truly)

Adds the semtimedop() function - semop with a timeout.  Solaris has
this.  It's apparently worth a couple of percent to Oracle throughput
and given the simplicity, that is sufficient benefit for inclusion IMO.

This patch hooks up semtimedop() only for ia64 and ia32.