[cairo] rendering changes cairo 1.16 -> 1.17.4

[Felix Schwarz]

Hi,

I'm trying to debug test failures in the WeasyPrint test suite (which uses cairo 
under the hood). The tests started to fail in Fedora rawhide around the same 
time as cairo 1.17.4 was added to Fedora.

I attached an example rendering:
- table_vertical_align.png is the actual rendering with cairo 1.17.4
- table_vertical_align.expected.png is the rendering in cairo 1.16.

My question is: Does anyone have an idea what could cause these rendering 
changes? Is there some new antialiasing setting enabled by default?

Please note that I'm not 100% sure that the cairo update is actually the root 
cause but I got confirmation that others seeing these failures as well.

Thank you very much,
Felix
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