Fix dynamic import in non webpack env regression #3345 (#4208)
Fix dynamic import in non webpack env regression #3345 (#4208)

Just in case #3345 was a regression and nextjs should still support non webpack node envs for testing.
JeromeFitz/next.js,azukaru/next.js,flybayer/next.js,BlancheXu/test,zeit/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,azukaru/next.js,BlancheXu/test,flybayer/next.js,zeit/next.js,BlancheXu/test,JeromeFitz/next.js,JeromeFitz/next.js,JeromeFitz/next.js,flybayer/next.js