efl: general distcheck fixes
Summary:
- Added missing C++ header
- Added missing elementary header
- Removed generated header from elementary_SOURCES
(Was added by raster in
42dfee37)
Not sure of what would be the best place for it, though.
- Removed previously removed files from elementary examples Makefile.
Test Plan: Run 'make distcheck'
Reviewers: stefan, felipealmeida
Subscribers: cedric
Differential Revision: https://phab.enlightenment.org/D5800
Signed-off-by: Cedric Bail <cedric@osg.samsung.com>