[cairo] patch adding a bunch of debug helpers

[Vladimir Vukicevic]

This patch adds a bunch of debug helpers in cairo-debug.c/h -- useful
for printing various internal data structures while tracking things
through cairo.  Included: cairo_debug_dump_clip,
cairo_debug_dump_path, cairo_debug_dump_traps,
cairo_debug_dump_trapezoid_array

- Vlad
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