Adding support for OpenGL functions

I have added code to expose some of the OpenGL functions. This was motivated by a need to determine the number of nVidia adapters present on a system. I had to make some changes to WinGDI.java and GDI32.java. I'm not sure why the pull request is attempting to replace the entire file, it may be due to indentation issues. Hope this is not a problem. I also removed a debug statmenet in the WinRas which was previously submitted.
David