Enable systemd-coredump for offline updates

If a crash occurs during an offline update, we do not get a
coredump, because systemd-coredump is not enabled. This of course
complicates debugging.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

units/meson.build

@@ -310,7 +310,7 @@ units = [
         {
           'file' : 'systemd-coredump.socket',
           'conditions' : ['ENABLE_COREDUMP'],
-          'symlinks' : ['sockets.target.wants/'],
+          'symlinks' : ['sockets.target.wants/', 'system-update-pre.target.wants/'],
         },
         {
           'file' : 'systemd-coredump@.service.in',