Fixes xcode 10 beta 4 compile error #9748
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Summary: When building iOS apps with a caffe2 dependency, we were seeing the
caffe2/caffe2/mobile/contrib/ios/mpscnn/mpscnn.mm:33:17: error: method 'copyWithZone:' in protocol 'NSCopying' not implemented [-Werror,-Wprotocol]. This fixes it by implementing a shallow copy with that method.Differential Revision: D8954332