Approaches to ITS#8772

[Ondřej Kuzník <ondra@mistotebe.net>]

If we add an expectation that recursive and simple mutexes can be
(un)locked in the same way, we can remove the function aliases without
incurring the useless duplication.

The only target that would be affected is mach cthreads since it
allegedly doesn't support recursive mutexes natively. I don't think it
exists as a viable target any more (for instance, there is hardly any
documentation to be found about it), so I'm inclined to stop supporting
it anymore.

So the proposed way to deal with it would be as follows:
1. Remove mach cthreads support
2. Remove the type distinction between the mutex types and drop
   recursive mutex (un)locking functions
3. Update accesslog to use the above
4. Drop rmutex.c

Any objections? 

-- 
Ondřej Kuzník
Senior Software Engineer
Symas Corporation                       http://www.symas.com
Packaged, certified, and supported LDAP solutions powered by OpenLDAP