elementary: Declare multibuttonentry in list of edje externals
elementary: Declare multibuttonentry in list of edje externals

Signed-off-by: Mike McCormack <mj.mccormack@samsung.com>

SVN revision: 65566

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