Stop closing STDOUT/STDERR in lib/streams.ts (#5419)
Stop closing STDOUT/STDERR in lib/streams.ts (#5419)

Fixes #5403 for Node versions prior to v10.12.0.
AustinXII/Pokemon-Showdown,xfix/Pokemon-Showdown,Enigami/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,Zarel/Pokemon-Showdown,urkerab/Pokemon-Showdown,svivian/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,svivian/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Zarel/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown,Enigami/Pokemon-Showdown,svivian/Pokemon-Showdown,urkerab/Pokemon-Showdown,xfix/Pokemon-Showdown,panpawn/Gold-Server,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,urkerab/Pokemon-Showdown,svivian/Pokemon-Showdown,svivian/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,Enigami/Pokemon-Showdown,panpawn/Gold-Server,AustinXII/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,panpawn/Gold-Server,jumbowhales/Pokemon-Showdown,Enigami/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown