[cairo] cl-cairo with X11 examples with mouse events handling

[Bill Spitzak]

This works. The code is extracted from the fltk2.0 source code so it has 
been somewhat tested.

   cc x11cairo.c -o x11cairo -lX11 -lcairo

It might be a good idea to add this to the Cairo examples, provided 
everybody considers it ok.

Another nice idea would be to make a portable "toy" toolkit that lets 
you create windows and draw with Cairo into them, and recompile on 
Windows and Linux and maybe OS/X. Sort of like Glut, which I think is 
part of the popularity of OpenGL.

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