[osg-submissions] Changes to VPB CMake project files for CMake 2.6

[Jean-Sébastien Guay]

Hello Mattias,

> tested on linux-2-6-24, gcc-4.2.3, CMake-2.6.0, VPB rev 914, osg rev 8405.
> CMakeLists work fine. build works fine. examples tested works fine.

Wow, ask and ye shall receive. Thanks a lot!

J-S
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Jean-Sebastien Guay    jean-sebastien.guay at cm-labs.com
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