[cairo] Information on cairo's missing support for hyperlinks in the PDF backend

[Adrian Johnson]

On 02/06/16 03:26, Gabriel Scherer wrote:
> - in 2011, 'Pander' submitted a bug report on the Cairo bugtracker
>   https://bugs.freedesktop.org/show_bug.cgi?id=40078
>   Adrian Johnson indicated in 2015 that there was interest
>   in having the feature for 1.16. I would warmly welcome any
>   news on this front.

So far it is still at the conceptual stage. I have a draft API but have
not yet had the time to start implementing it.