[PR] Fix Http_lite to work on Windows
[PR] Fix Http_lite to work on Windows

Summary:
`flow ide` wasn't working on Windows because our HTTP headers output CRCRLF instead of CRLF. This is because the output channel was in text mode, which converts LF to CRLF on output ([Microsoft docs](https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/setmode)).

Anyway, hopefully this fixes.
Closes https://github.com/facebook/flow/pull/4779

Differential Revision: D5760150

Pulled By: gabelevi

fbshipit-source-id: b91a3ae42dbf6760c95affa2720471d405291d51

TiddoLangerak/flow,mroch/flow,AgentME/flow,mroch/flow,TiddoLangerak/flow,MichaelDeBoey/flow,gabelevi/flow,JonathanUsername/flow,popham/flow,popham/flow,JonathanUsername/flow,mroch/flow,jamesgpearce/flow,jamesgpearce/flow,mroch/flow,samwgoldman/flow,nmote/flow,samwgoldman/flow,jamesgpearce/flow,JonathanUsername/flow,claudiopro/flow,AgentME/flow,claudiopro/flow,popham/flow,samwgoldman/flow,AgentME/flow,JonathanUsername/flow,samwgoldman/flow,facebook/flow,gabelevi/flow,facebook/flow,gabelevi/flow,AgentME/flow,samwgoldman/flow,TiddoLangerak/flow,TiddoLangerak/flow,claudiopro/flow,MichaelDeBoey/flow,jamesgpearce/flow,mroch/flow,samwgoldman/flow,nmote/flow,facebook/flow,gabelevi/flow,gabelevi/flow,jamesgpearce/flow,ylu1317/flow,popham/flow,facebook/flow,nmote/flow,popham/flow,claudiopro/flow,JonathanUsername/flow,JonathanUsername/flow,facebook/flow,samwgoldman/flow,facebook/flow,mroch/flow,ylu1317/flow,JonathanUsername/flow,ylu1317/flow,nmote/flow,MichaelDeBoey/flow,popham/flow,TiddoLangerak/flow,claudiopro/flow,popham/flow,MichaelDeBoey/flow,gabelevi/flow,gabelevi/flow,ylu1317/flow,jamesgpearce/flow,facebook/flow,ylu1317/flow,nmote/flow,nmote/flow,MichaelDeBoey/flow,mroch/flow,AgentME/flow,nmote/flow,jamesgpearce/flow