change name of include guard E_COMP_H
change name of include guard E_COMP_H

Summary: e_comp is not an e module anymore.

Test Plan: N/A

Reviewers: raster, devilhorns, zmike

CC: cedric

Differential Revision: https://phab.enlightenment.org/D791

FlorentRevest/Enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment,tasn/enlightenment,tasn/enlightenment,FlorentRevest/Enlightenment,rvandegrift/e,rvandegrift/e,tasn/enlightenment