[osg-submissions] Fix for flickering in osgviewerWX example

[Brandon Hamm]

This is a fix for severe flickering of the display window when events (such
as mouse enter/leave, key down/up) when running the osgviewerWX example
program.  The problem is that wxGLCanvas is created as a single-buffered
surface by default.  I've modified the constructor for GraphicsWindowWX to
take an array of integer attributes, and creating a double-buffered
surface.

Thanks,

Brandon Hamm
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