elm_entry: play nice with stringshare.
elm_entry: play nice with stringshare.

This avoids removing entries from cache to just add them later if it
was the last reference count.



SVN revision: 43674

rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary