[boost] [interprocess] upgradeable_mutex_test deadlocking on sun-5.8

The upgradeable_mutex_test test in the interprocess library is deadlocking on sun-5.8 (Sparc). This kind of problem is breaking our regression testing too often. It's not Ion's fault: the regression testing needs to be robust against this kind of failure. On Windows, we have the built-monitor option to kill stuck processes. On Unix, we could just set the ulimit and be done with it... but how to integrate this into bjam/BBv2? - Doug