[cairo] "operator" keyword in libcairo

[Bill Spitzak]

Carl Worth wrote:

>>(For 'class', for historical reasons we use 'klass')
>
> How kewl. Given the choice, I'd abbreviate before misspelling. ;-)

In the code here we used "Class". Not that I'm suggesting that's a good 
solution, it obviously breaks most people's case rules for function and 
variable names.

Xlib header files use "c_class" which is really lame.