[cairo] Patches for compilation in Win32

[Antoine Azar]

> > The other one improves the makefiles, removes cairo-operator.c from
> > the Makefiles, and fixes a variable definition that VC++ doesn't 
> seem to like.
>
>This one doesn't apply anymore.  Can you send an updated one?


I had a mighty fight with git but my rebase seems (hopefully) correct 
now. Here's a new patch.

Antoine 
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