[cairo] cairo -> cairo c src backend

[Mike Emmel]

I've come up with a intresting idea esp for svg frontends on cairo.

If we added a backend that simply prints the cairo drawing commands as
a C source
function or functions we have a pretty decent compiler in particular
static svg->native.
It would be useful for svg widgets for example.

Worst case is it would be useful for debugging cairo performance
issues for various
front ends.

Mike