Add -fPIC to jni target
Add -fPIC to jni target

Summary: Add compile flag from CSSLayout to jni target as well

Reviewed By: passy

Differential Revision: D4248473

fbshipit-source-id: 18a163a3daedc56e98c7bdc38e10fc8626999f94

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