[cairo] [patch] cairo sanity checking

[graydon hoare]

hi,

this patch adds a simple sanity-checking routine to cairo. I've found, 
so far, one way in which the cairo_t goes "insane" during operations 
(further patch follows) so I thought I'd add a simple place to add 
further sanity checks as pre- and post-conditions on each user-level 
operation.

comments? ok to commit?

-graydon
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