add compiler flag of optimazation level
add compiler flag of optimazation level

## Note
This patch does not add flag into Android.
Because it cause error when launch the Android app if add flag.

HipByte/motion-game,casper91/motion-game,HipByte/motion-game,casper91/motion-game,casper91/motion-game,casper91/motion-game,HipByte/motion-game,HipByte/motion-game