PROBLEM: (87500, 87891, HPAQ20JQV) (PATCH ID: OSF510-261)
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When both libaio and libaio_raw are linked into the same image, the run-time
environment will execute both __init_aio routines - which register prefork
handlers that take a mutex.  This causes the prefork handler to be called twice
by the same thread.  The first gets the mutex and the second blocks forever.
The final fix is probably to combine libaio and libaio_raw into a single image
so that the above can't happen.  Until then, we'll warn the user when we
detect both libraries in the same executable.