[osg-submissions] msvc 7.1 compile

[Mathias Fröhlich]

Hi Robert,

Update to the configure check for msvc 7.1.
MemoryBarrier() is used in the implementation, so it should be checked.
This in effect disables the faster atomic ops on msvc 7.1 and older, even if 
only the MemoryBarrier() call is missing. But it ensures for the fist cut 
that it will build everywhere. If somebody cares for msvc 7.1 enough and has 
one for testing installed, he might provide the apropriate defines to guard 
that MemoryBarrier() call.

I tested that msvc8 32/64bit still passes the configure tests and compiles.

Attached a change to the configure check based on rev 8508.

Greetings and nice Weekend!

Mathias

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