Eolian: fix dependency for .eo.c/h files.
Eolian: fix dependency for .eo.c/h files.

When Eolian generator is updated, the .eo.c/h files of Elementary must be
regenerated.

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