pans implementation of Efl.Content is different to each other
implementation, setting the content to NULL is not really deleting the
obejct, since this is done at those widgets that are actaully using the
pan. This is weird and fine in the same way, as the pan is only
internal. However, when we are shutting down, we must free the content
here.
Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D10838
Marcel Hollerbach
7a72796920