Cheng Zhao f71e3b80b9 Add YGConfigCopy
Summary: Closes https://github.com/facebook/yoga/pull/525

Differential Revision: D4953723

Pulled By: emilsjolander

fbshipit-source-id: 1c54f40dfae5054822a440edf9d0aafb22a465d9
2017-04-26 12:00:49 -07:00
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