Add license header to `fb_native_wrapper.bzl`
Add license header to `fb_native_wrapper.bzl`

Summary:
Github and fbsource got out of sync, we have a PR to fix this: https://github.com/facebook/yoga/pull/843

This updates the internal-only file to match the PR, so that we can merge it without hassle.

Reviewed By: cuva

Differential Revision: D13879526

fbshipit-source-id: f83115617e580e118a5f4e0f37e877db38a8fcac

facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/yoga