[osg-submissions] osgconv --compressed not working under MSVC

[Luigi Calori]

building under Visual Studio 7.1 in debug mode the current osgconv is 
not able to compress textures : it complains:

Failed to create pbuffer, failing back to normal graphics window.
Error: Unable to create graphis context - cannot run compression

this patch solved for me (similar to VPB problem)
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