[cairo] cairo_win32_surface_create api change

[Keith Packard]

> I spent some time tracking down the problem with trap-clip.c on win32,
> and it wasn't really related to the win32 code at all.
> 
> Note that _cairo_surface_get_extents() is possibly dependent
> on the clip ... this has always been the case and was intended to be
> the case, though it isn't entirely clear from the function docs.
> 
> All the code calling _cairo_surface_get_extents() expects this, but the
> problem is that the call in _cairo_clip_intersect_mask() is calling
> _cairo_surface_get_extents() on a surface *where the clip isn't 
> up-to-date*.

So _cairo_surface_get_extents should update the clip before computing
the extents, right? Not setting the clip lazily will cause serious
troubles for some backends iirc.

-keith

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