Improve application launching speed

Improve application launching speed

To improve app launching speed on Tizen (using launchpad), Use -fPIE option instead -fPIC and attach DALI_EXPORT_API in front of each example's main function.

This is the compare result between before and after patch.
(On hawkP 2.4 / using hello-dalidemo that has one pushbutton on stage)

|    before Patch     |     After Patch     |
---------------------------------------------
|   hello-dalidemo    |   hello-dalidemo    |
---------------------------------------------
|   AVG   MIN   MAX   |   AVG   MIN   MAX   |
|  1134  1060  1188   |   291   250   337   |

After patch, launching speed drops to 30% of before.

Change-Id:I51a4f673d016f9278f867167dc2ff9f407ea6e7e