winex11.drv: recognize WGL_SWAP_METHOD_ARB wgl pixel format attribute.

[Alexander Sabourenkov]

WGL_SWAP_METHOD attribute is not handled. Explicitly skip it in 
ConvertAttribWGLtoGLX and always return WGL_SWAP_UNDEFINED_ARB in 
X11DRV_wglGetPixelFormatAttribivARB, because buffers are always in 
undefined state after swap in GLX.

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