[osg-submissions] Use atomic reference counts

[Robert Osfield]

Hi Mathias,

Looking at include/OpenThreads/Atomic

There is:

#if defined(_OPENTHREADS_ATOMIC_USE_MUTEX)
    mutable Mutex _mutex;
#endif


Should this not be:

#if !defined(_OPENTHREADS_ATOMIC_USE_MUTEX)
    mutable Mutex _mutex;
#endif

--

On a different note, The Confg.in is a new one on me, I presume Cmake
generates the actual Config.  As a general note I've always kept
header directories so that they only ever contain the actual files
that would be installed, no build related files go in at all.  Your
submission breaks this separation.  It might be worth moving this
Config.in into another directory to avoid confusion.

--

I'll continue reviewing the changes so that I can get my head around it all.

Robert.

Robert.