Fix for Overflow error in CCRandom on 4S device.
Fix for Overflow error in CCRandom on 4S device.

Add unchecked when creating the SystemRandom seed for iOS devices new System.Random(unchecked((int)DateTime.UtcNow.Ticks));

See issue https://github.com/mono/CocosSharp/issues/282

haithemaraissia/CocosSharp,haithemaraissia/CocosSharp,MSylvia/CocosSharp,zmaruo/CocosSharp,zmaruo/CocosSharp,mono/CocosSharp,TukekeSoft/CocosSharp,TukekeSoft/CocosSharp,mono/CocosSharp,MSylvia/CocosSharp