Unfortunately, GLES2 on Windows is not so easy, because there really isn't a GraphicWindowEGL implementation that would work on Windows.
I started writing one, but got bogged down and had to abandon it. You might consider not compiling the GraphicsWindowWin32 code and just using GraphicsWindowEmbedded and using EGL functions in your app's code to create a context, and then pass it to OSG. Also, we might be able to help you more if we knew what exactly you were trying to accomplish in the end.
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