I've applied the patch[1] attached to comment 21 of the upstream bug to the Ubuntu packages. While it only works for gnome-screensaver, it doesn't break anything else, and should be reasonably easy to add support for other screensavers there. I don't have much motivation to do that work myself though, since gnome-screensaver covers almost all modern GNOME environments just fine.
[1] http://bugzilla.pculture.org/attachment.cgi?id=1221
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