Update format.sh
Update format.sh

Summary:
The format.sh was referring to an outdated `benchmarks/` directory and left out
a bunch of other C/C++ files. This updates it to cover all but the build
artifacts and vendored libraries in `lib/`.

Reviewed By: emilsjolander

Differential Revision: D4481490

fbshipit-source-id: 056e00359f794d0aa999fd65ec1ef0c657738867

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