Fix dll path in Unity build script
Fix dll path in Unity build script

Summary: sync with vcproj

Reviewed By: emilsjolander

Differential Revision: D4384510

fbshipit-source-id: 964c5b84c063a5241b3aab0f276b2b5a080677aa

yihuang/css-layout,facebook/css-layout,yihuang/css-layout,rmarinho/yoga,yihuang/css-layout,facebook/yoga,rmarinho/yoga,yihuang/css-layout,facebook/yoga,yihuang/css-layout,yihuang/css-layout,facebook/css-layout,facebook/css-layout,rmarinho/yoga,rmarinho/yoga,facebook/css-layout,facebook/yoga,rmarinho/yoga,facebook/yoga,yihuang/css-layout,facebook/yoga,facebook/css-layout,facebook/css-layout,facebook/yoga,rmarinho/yoga,rmarinho/yoga,rmarinho/yoga,facebook/css-layout,facebook/css-layout,facebook/yoga,rmarinho/yoga,facebook/yoga,rmarinho/yoga,facebook/yoga,yihuang/css-layout,facebook/yoga,yihuang/css-layout,yihuang/css-layout,facebook/css-layout