[build] Remove make_relative_symlink from build-script-impl
[build] Remove make_relative_symlink from build-script-impl

Nothing uses this anymore, remove it.

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