[osg-submissions] atomic operations not pulling windows.h

[Mathias Fröhlich]

Hi Robert,

Attached is a change to that atomic stuff to move the win32, msvc 
implementation of the atomic increment and decrement into a implementation 
file.
This way inlining and compiler optimization can no longer happen for these 
implementations, but it fixes compilation on win32 msvc targets. I expect 
that this is still faster than with with mutexes.

Also the i386 gcc target gets atomic operations with this patch. By using an 
implementation file we can guarantee that we have the right compiler flags 
available.

Tell me if you want to have something different here.

This time tested on
win32, msvc 8 32 and 64 bit,
Suse 10.2, gcc-4.3.1, 64 bit
Suse 9.0, gcc-4.3.1, 32 bit
hpux, irix and sunos builds, they at least compile the atomic stuff. They all 
hang currently on other code in osg* these compilers do not like ...

The change is based on rev 8492.

GReetings and thanks for your patience

MAthias

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