node: child_process.execFile callback passes extended error object
node: child_process.execFile callback passes extended error object

Summary: Closes https://github.com/facebook/flow/pull/2407

Differential Revision: D3835190

Pulled By: mroch

fbshipit-source-id: 6c1d3f8481f091070961864aa1a07d719eb9924f

jgrund/flow,gabelevi/flow,AgentME/flow,fletcherw/flow,samwgoldman/flow,facebook/flow,JonathanUsername/flow,chenglou/flow,AprilArcus/flow,mroch/flow,TiddoLangerak/flow,JonathanUsername/flow,mroch/flow,chenglou/flow,gabelevi/flow,mroch/flow,popham/flow,fletcherw/flow,ForbesLindesay/flow,gabro/flow,MichaelDeBoey/flow,AprilArcus/flow,chenglou/flow,chenglou/flow,MichaelDeBoey/flow,nmote/flow,TiddoLangerak/flow,ForbesLindesay/flow,popham/flow,gabelevi/flow,jamesgpearce/flow,facebook/flow,JonathanUsername/flow,claudiopro/flow,jamesgpearce/flow,MichaelDeBoey/flow,mroch/flow,chenglou/flow,ForbesLindesay/flow,popham/flow,jgrund/flow,gabelevi/flow,fletcherw/flow,gabro/flow,popham/flow,jamesgpearce/flow,popham/flow,ylu1317/flow,gabelevi/flow,facebook/flow,nmote/flow,gabro/flow,nmote/flow,AprilArcus/flow,nmote/flow,nmote/flow,facebook/flow,samwgoldman/flow,ForbesLindesay/flow,jgrund/flow,MichaelDeBoey/flow,claudiopro/flow,jamesgpearce/flow,AgentME/flow,JonathanUsername/flow,ylu1317/flow,nmote/flow,ForbesLindesay/flow,MichaelDeBoey/flow,claudiopro/flow,AgentME/flow,jgrund/flow,AprilArcus/flow,gabelevi/flow,AgentME/flow,ylu1317/flow,AgentME/flow,jamesgpearce/flow,JonathanUsername/flow,jgrund/flow,gabro/flow,TiddoLangerak/flow,mroch/flow,AprilArcus/flow,claudiopro/flow,samwgoldman/flow,samwgoldman/flow,jamesgpearce/flow,ylu1317/flow,jamesgpearce/flow,mroch/flow,popham/flow,gabro/flow,facebook/flow,JonathanUsername/flow,claudiopro/flow,popham/flow,AprilArcus/flow,fletcherw/flow,JonathanUsername/flow,nmote/flow,gabro/flow,TiddoLangerak/flow,ForbesLindesay/flow,fletcherw/flow,fletcherw/flow,ylu1317/flow,samwgoldman/flow,samwgoldman/flow,gabelevi/flow,mroch/flow,samwgoldman/flow,jgrund/flow,TiddoLangerak/flow,chenglou/flow,facebook/flow,facebook/flow