Add size optimization GCC options

Add size optimization GCC options

Code size optimization via GCC option.

M34 patches:
- http://165.213.202.130:8080/#/c/67343/
- http://165.213.202.130:8080/#/c/67639/
- http://165.213.202.130:8080/#/c/67564/

Test result of libchromium-ewk.so size in mobile:
- Base : 35M after strip (63M before strip)
- After: 25M after strip (54M before strip)

Bug: http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=11607
Reviewed by: Antonio Gomes, Piotr Tworek

Change-Id: I639e8a929d2b99b71687d88c4a282541319e9e56
Signed-off-by: SeungSeop Park <sns.park@samsung.com>