Partially revert "Keep gyb from messing up line endings on Windows"
Partially revert "Keep gyb from messing up line endings on Windows"

This reverts most of commit 85599f7582b8809be889f589fe4d1d95e09ec945; it turns out the ‘b’ flag changes behavior more drastically in Python 3.

Fixes SR-12328, rdar://problem/60230415.

nathawes/swift,JGiola/swift,hooman/swift,tkremenek/swift,atrick/swift,ahoppen/swift,jckarter/swift,benlangmuir/swift,nathawes/swift,parkera/swift,airspeedswift/swift,stephentyrone/swift,parkera/swift,tkremenek/swift,hooman/swift,allevato/swift,rudkx/swift,jmgc/swift,aschwaighofer/swift,aschwaighofer/swift,airspeedswift/swift,CodaFi/swift,rudkx/swift,JGiola/swift,roambotics/swift,airspeedswift/swift,gregomni/swift,apple/swift,jckarter/swift,rudkx/swift,stephentyrone/swift,hooman/swift,benlangmuir/swift,tkremenek/swift,ahoppen/swift,jmgc/swift,rudkx/swift,harlanhaskins/swift,jmgc/swift,tkremenek/swift,stephentyrone/swift,glessard/swift,gregomni/swift,stephentyrone/swift,allevato/swift,jmgc/swift,rudkx/swift,xwu/swift,apple/swift,gregomni/swift,xwu/swift,atrick/swift,gregomni/swift,nathawes/swift,gregomni/swift,hooman/swift,harlanhaskins/swift,allevato/swift,roambotics/swift,ahoppen/swift,parkera/swift,gregomni/swift,jmgc/swift,atrick/swift,apple/swift,CodaFi/swift,parkera/swift,harlanhaskins/swift,tkremenek/swift,jckarter/swift,atrick/swift,parkera/swift,jckarter/swift,xwu/swift,jckarter/swift,parkera/swift,harlanhaskins/swift,allevato/swift,aschwaighofer/swift,nathawes/swift,CodaFi/swift,ahoppen/swift,JGiola/swift,CodaFi/swift,benlangmuir/swift,harlanhaskins/swift,apple/swift,jckarter/swift,JGiola/swift,CodaFi/swift,glessard/swift,xwu/swift,roambotics/swift,allevato/swift,airspeedswift/swift,allevato/swift,xwu/swift,stephentyrone/swift,allevato/swift,benlangmuir/swift,glessard/swift,parkera/swift,aschwaighofer/swift,jckarter/swift,nathawes/swift,ahoppen/swift,apple/swift,CodaFi/swift,glessard/swift,glessard/swift,harlanhaskins/swift,stephentyrone/swift,benlangmuir/swift,benlangmuir/swift,jmgc/swift,atrick/swift,apple/swift,harlanhaskins/swift,roambotics/swift,hooman/swift,parkera/swift,rudkx/swift,hooman/swift,tkremenek/swift,hooman/swift,airspeedswift/swift,aschwaighofer/swift,airspeedswift/swift,tkremenek/swift,ahoppen/swift,atrick/swift,nathawes/swift,airspeedswift/swift,xwu/swift,glessard/swift,roambotics/swift,JGiola/swift,jmgc/swift,aschwaighofer/swift,nathawes/swift,xwu/swift,JGiola/swift,roambotics/swift,stephentyrone/swift,CodaFi/swift,aschwaighofer/swift