[osg-submissions] CMakeLists.txt - support for Visual Studio /MP option

[sherman wilcox]

Here is a patch for cmakelists.txt to add support for the /MP option
in Microsoft compilers as discussed in osg-users. There is now an
advanced option called WIN32_USE_MP (which defaults to OFF) that will
enable the /MP switch for all builds. I tucked this code block safely
within a IF(WIN32) branch.

Feel free to modify as necessary.
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