* gnu/packages/patches/gnome-session-support-elogind.patch: New file.
* gnu/local.mk: Add it.
* gnu/packages/gnome.scm (gnome-session)[source]: Use it.
[arguments]: Add "-Delogind=true" to #:configure-flags; remove
phases that patch in old-style elogind support.
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>