build-script: remove dead CMake options for Swift
build-script: remove dead CMake options for Swift

The build system does not support fine grained control over the tools.
Ideally we would do this by hooking into the llvm distribution
mechanism.

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