fix the compile error in Xcode 4.6 for mac platform which trigger by the Architectures’ value
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3_fix
Merge pull request #6732 from samuele3hu/v3_fix

fix compile error in Xcode 4.6 for mac platform which trigger by the Architectures’ value