[osg-submissions] Changes to VPB CMake project files for building under VS 7.1

[Luigi Calori]

It seems vs 7.1 does not define correctly vsnprintf

 this hack solve the build problem of current svn vpb under MSVC 7.1

I agree with J-S that 

>>Perhaps OSG's CMakeModules directory could be shared between OSG and VPB,
>>since VpbMacroUtils.cmake for one is almost identical to OsgMacroUtils.cmake
>>(and should probably *be* identical).
>>
>>Anyways, hope this brings you closer to being able to do a VPB 1.0 release
>>    
>>

thanks
            Luigi
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