Remove `system` to fix compiling error with iOS 11

Before cocos2d-x v3.16, CCFileUtils uses system() to remove a directory. iOS 11 remove system, so will cause compiling error with iOS 11. cocos2d-x v3.16 fixes this issue, and will be released about on Oct.9. The corresponding PR for this issue is here, you can apply this PR to fix it.

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Thanks @zhangxm, that solve the problem