Add 'create-react-class' to react dependencies for build

[flarnie]

what is the change?:
We needed this dependency in the package.json

why make this change?:
Even though create-react-class was added as a dependency to the
package.json in https://github.com/facebook/react/pull/9399/files we
didn't completely cherry-pick this change onto 15.6 from master in b48b259

This fixes that omission.
Following this fix we will review PR 9399 and make sure nothing else was
missed.

test plan:
yarn build and inspect the builds/packages/react/package.json, see
that create-react-class is included.

issue:
#9830

Before submitting a pull request, please make sure the following is done:

1. Fork the repository and create your branch from master.
2. If you've added code that should be tested, add tests!
3. If you've changed APIs, update the documentation.
4. Ensure the test suite passes (npm test).
5. Make sure your code lints (npm run lint).
6. Format your code with prettier (npm run prettier).
7. Run the Flow typechecks (npm run flow).
8. If you added or removed any tests, run ./scripts/fiber/record-tests before submitting the pull request, and commit the resulting changes.
9. If you haven't already, complete the CLA.