Re: AOO plugin for PD on SGI Irix

I checked, AOO_HAVE_PTHREAD_RWLOCK is set true. 
I also intentionally failed this test to get mutex implementation, same behavior (maybe a bit worse in performance).

So I wrote a test that does an exclusive write lock/unlock and a couple of concurrent shared reader locks, it worked when just run without repetition. When repeating it a thousand times, I started to see once in a while when it seemingly randomly missed to get a reader lock. 

This looks like a bug in the newer GCC pthread implementation for legacy MIPS (needed for C++11/17). 
Atomics and locks work with the native MIPSpro compiler, which however can only do C99/C++98. 

The workaround above works because if it misses that shared lock once in many executions only, a repeat try catches it without adding much computational overhead. 

Maybe I find a better solution at some point, or some platform specific compiler flag optimization that improve/fix it. 

Thanks for your debug suggestions!
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