This only handles the GDM greeter.  As I mention in the upstream bug
(which is now closed, since that hibernate menu is Ubuntu-specific
apparently -- I didn't realize), there are better ways of handling it
(via hal like you mention):

"(B) It would be nicer to use HAL to ask the system if it can hibernate.  We
could check power_management.can_hibernate which tells us if hibernation
support is even compiled into the kernel.  And we could iterate over the
volumes, checking the fstype of each for "swap" -- a cleaner way to check for
swaps."

Which should be done in both GDM, gnome-session, and FUSA.

This patch just does it for GDM, and in the 'easy' way.

-- 
Don't offer Hibernate option if no swap
https://bugs.launchpad.net/bugs/320208
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