[Bug 1551949]

[Jonathan Watt]

FWIW cairo has [functionality for creating
links](https://www.cairographics.org/manual/cairo-Tags-and-Links.html)
as of v1.16, but it looks like the in-tree cairo is too old (v1.9.5).

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https://bugs.launchpad.net/bugs/1551949

Title:
  Printing to PDF file loses URLs/links

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