Add DALI_EXPORT_API to main()
Add DALI_EXPORT_API to main()

sometimes deferred-shading demo fail to launch due to main() is not found
Add DALI_EXPORT_API to ensure export of main()

Change-Id: I2fe96baa8679c2bf0edc4d9ed5bdd52a59ffc11a

dalihub/dali-demo,dalihub/dali-demo,dalihub/dali-demo,dalihub/dali-demo