cairo and gtk+ 2.8

[muppet <scott asofyet org>]

gtk+ cvs HEAD now depends on cairo, and the next stable version will, 
too.

iirc, there are some fledgeling perl bindings for cairo in cairo's cvs 
(written by someone we know :-).  will these be stable in time for us 
to depend on them when gtk+ 2.8 comes out?

(i'm not sure at this point whether cairo is exposed from gtk+, but i 
believe it is.)

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