fix: Import custom identifier called css with error "Cannot find module 'linaria'" #739

[GitaiQAQ]

Motivation

#739

Summary

When import css from some module like './utils', webpack will throw an error "Cannot find module 'linaria'"

import { css } from './utils';

...

Because the package 'linaria' is deprecated, At here try the resolve this. And then require.resolve will throw an exception.

Test plan

use this case https://codesandbox.io/s/linaria-demo-forked-rbivr?file=/src/index.js

[callstack-bot]

Hey @GitaiQAQ, thank you for your pull request 🤗.
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