The attached patch enhances compatibility with QT 4.0 on Windows. QT
implements an abstraction of an OpenGL context in its QGLContext class.
To create a context QGLContext always calls wglCreateLayerContext() even
though a call to wglCreateContext() would do. To account for this I
changed the implementation of wglCreateLayirContext_prox() in
opengl_stub/wgl.c such that it forwards the call to
wglCreateContext_prox() if layerPlane == 0.
Michael
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