code clean-up in opengl_stub/

The stubCreateContext() routine in context.c was a bunch of #ifdef'd 
code.  I've moved the body of that function into each of the glx.c, 
wgl.c and cgl.c files and removed the unneeded #ifdef clauses.

I don't think I broke the wgl or cgl code.  But if I did, let me know. 
  I'm sure the fixes will be trivial.

-Brian



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