SourceKit CMake: remove code to handle legacy SDKs
SourceKit CMake: remove code to handle legacy SDKs

calebd/swift,glessard/swift,modocache/swift,gottesmm/swift,djwbrown/swift,gottesmm/swift,harlanhaskins/swift,OscarSwanros/swift,zisko/swift,gmilos/swift,xwu/swift,shajrawi/swift,jopamer/swift,deyton/swift,tinysun212/swift-windows,atrick/swift,nathawes/swift,ben-ng/swift,JaSpa/swift,dduan/swift,karwa/swift,gribozavr/swift,dduan/swift,atrick/swift,dreamsxin/swift,aschwaighofer/swift,tkremenek/swift,jopamer/swift,alblue/swift,kstaring/swift,ben-ng/swift,ken0nek/swift,danielmartin/swift,return/swift,slavapestov/swift,jmgc/swift,felix91gr/swift,ken0nek/swift,therealbnut/swift,kperryua/swift,bitjammer/swift,airspeedswift/swift,JGiola/swift,rudkx/swift,devincoughlin/swift,atrick/swift,russbishop/swift,ahoppen/swift,shajrawi/swift,devincoughlin/swift,gottesmm/swift,danielmartin/swift,sschiau/swift,adrfer/swift,KrishMunot/swift,shahmishal/swift,xwu/swift,return/swift,gribozavr/swift,slavapestov/swift,devincoughlin/swift,karwa/swift,adrfer/swift,adrfer/swift,roambotics/swift,parkera/swift,practicalswift/swift,manavgabhawala/swift,milseman/swift,allevato/swift,return/swift,frootloops/swift,tkremenek/swift,gmilos/swift,xwu/swift,tjw/swift,xedin/swift,gmilos/swift,gribozavr/swift,gottesmm/swift,calebd/swift,tinysun212/swift-windows,bitjammer/swift,tardieu/swift,swiftix/swift,shahmishal/swift,ahoppen/swift,huonw/swift,aschwaighofer/swift,hughbe/swift,calebd/swift,adrfer/swift,IngmarStein/swift,shajrawi/swift,kstaring/swift,SwiftAndroid/swift,deyton/swift,Jnosh/swift,shajrawi/swift,austinzheng/swift,xwu/swift,codestergit/swift,calebd/swift,glessard/swift,dduan/swift,uasys/swift,zisko/swift,Jnosh/swift,hughbe/swift,karwa/swift,benlangmuir/swift,JaSpa/swift,modocache/swift,jckarter/swift,kperryua/swift,russbishop/swift,roambotics/swift,glessard/swift,alblue/swift,slavapestov/swift,djwbrown/swift,adrfer/swift,hooman/swift,devincoughlin/swift,felix91gr/swift,jmgc/swift,ben-ng/swift,shajrawi/swift,hooman/swift,stephentyrone/swift,jtbandes/swift,ken0nek/swift,harlanhaskins/swift,aschwaighofer/swift,hooman/swift,tinysun212/swift-windows,brentdax/swift,atrick/swift,russbishop/swift,jtbandes/swift,brentdax/swift,gribozavr/swift,jopamer/swift,practicalswift/swift,sschiau/swift,manavgabhawala/swift,arvedviehweger/swift,CodaFi/swift,arvedviehweger/swift,tardieu/swift,tjw/swift,amraboelela/swift,kstaring/swift,roambotics/swift,swiftix/swift,CodaFi/swift,frootloops/swift,codestergit/swift,apple/swift,sschiau/swift,swiftix/swift,deyton/swift,apple/swift,lorentey/swift,OscarSwanros/swift,stephentyrone/swift,gregomni/swift,JGiola/swift,rudkx/swift,manavgabhawala/swift,felix91gr/swift,practicalswift/swift,airspeedswift/swift,hooman/swift,hughbe/swift,bitjammer/swift,gottesmm/swift,harlanhaskins/swift,jckarter/swift,IngmarStein/swift,harlanhaskins/swift,bitjammer/swift,JGiola/swift,tinysun212/swift-windows,swiftix/swift,Jnosh/swift,bitjammer/swift,lorentey/swift,codestergit/swift,shajrawi/swift,deyton/swift,russbishop/swift,frootloops/swift,airspeedswift/swift,calebd/swift,jtbandes/swift,sschiau/swift,djwbrown/swift,gribozavr/swift,practicalswift/swift,jmgc/swift,amraboelela/swift,karwa/swift,airspeedswift/swift,aschwaighofer/swift,natecook1000/swift,modocache/swift,ahoppen/swift,return/swift,xedin/swift,Jnosh/swift,shahmishal/swift,hooman/swift,austinzheng/swift,kperryua/swift,gottesmm/swift,therealbnut/swift,austinzheng/swift,karwa/swift,huonw/swift,xedin/swift,natecook1000/swift,dduan/swift,adrfer/swift,tardieu/swift,amraboelela/swift,tardieu/swift,jmgc/swift,dduan/swift,SwiftAndroid/swift,rudkx/swift,OscarSwanros/swift,calebd/swift,devincoughlin/swift,kstaring/swift,tkremenek/swift,dduan/swift,brentdax/swift,huonw/swift,amraboelela/swift,arvedviehweger/swift,codestergit/swift,kperryua/swift,IngmarStein/swift,return/swift,felix91gr/swift,shahmishal/swift,JaSpa/swift,xedin/swift,SwiftAndroid/swift,harlanhaskins/swift,atrick/swift,glessard/swift,tjw/swift,kstaring/swift,russbishop/swift,ken0nek/swift,gmilos/swift,IngmarStein/swift,stephentyrone/swift,aschwaighofer/swift,kperryua/swift,russbishop/swift,jckarter/swift,allevato/swift,therealbnut/swift,jmgc/swift,milseman/swift,uasys/swift,johnno1962d/swift,tardieu/swift,IngmarStein/swift,Jnosh/swift,tjw/swift,apple/swift,tardieu/swift,zisko/swift,tinysun212/swift-windows,parkera/swift,djwbrown/swift,dduan/swift,gregomni/swift,apple/swift,austinzheng/swift,amraboelela/swift,huonw/swift,sschiau/swift,SwiftAndroid/swift,return/swift,jckarter/swift,kstaring/swift,danielmartin/swift,roambotics/swift,uasys/swift,codestergit/swift,johnno1962d/swift,jtbandes/swift,OscarSwanros/swift,therealbnut/swift,lorentey/swift,ken0nek/swift,modocache/swift,airspeedswift/swift,huonw/swift,KrishMunot/swift,KrishMunot/swift,brentdax/swift,gmilos/swift,return/swift,rudkx/swift,alblue/swift,jopamer/swift,benlangmuir/swift,rudkx/swift,slavapestov/swift,djwbrown/swift,swiftix/swift,jckarter/swift,lorentey/swift,jopamer/swift,huonw/swift,slavapestov/swift,modocache/swift,slavapestov/swift,zisko/swift,hughbe/swift,therealbnut/swift,bitjammer/swift,xwu/swift,codestergit/swift,SwiftAndroid/swift,johnno1962d/swift,CodaFi/swift,Jnosh/swift,stephentyrone/swift,ken0nek/swift,Jnosh/swift,therealbnut/swift,sschiau/swift,felix91gr/swift,roambotics/swift,parkera/swift,OscarSwanros/swift,natecook1000/swift,johnno1962d/swift,stephentyrone/swift,karwa/swift,huonw/swift,xedin/swift,allevato/swift,austinzheng/swift,tinysun212/swift-windows,alblue/swift,tkremenek/swift,practicalswift/swift,KrishMunot/swift,practicalswift/swift,stephentyrone/swift,manavgabhawala/swift,gmilos/swift,alblue/swift,alblue/swift,airspeedswift/swift,IngmarStein/swift,xwu/swift,deyton/swift,lorentey/swift,brentdax/swift,gribozavr/swift,harlanhaskins/swift,uasys/swift,arvedviehweger/swift,tjw/swift,zisko/swift,jckarter/swift,ben-ng/swift,jtbandes/swift,russbishop/swift,milseman/swift,CodaFi/swift,nathawes/swift,jopamer/swift,shahmishal/swift,CodaFi/swift,bitjammer/swift,nathawes/swift,arvedviehweger/swift,glessard/swift,SwiftAndroid/swift,brentdax/swift,allevato/swift,devincoughlin/swift,hughbe/swift,adrfer/swift,codestergit/swift,natecook1000/swift,xwu/swift,lorentey/swift,gregomni/swift,parkera/swift,ahoppen/swift,johnno1962d/swift,gottesmm/swift,benlangmuir/swift,shahmishal/swift,JGiola/swift,ahoppen/swift,milseman/swift,practicalswift/swift,nathawes/swift,tardieu/swift,ben-ng/swift,nathawes/swift,hughbe/swift,parkera/swift,apple/swift,aschwaighofer/swift,uasys/swift,danielmartin/swift,xedin/swift,OscarSwanros/swift,devincoughlin/swift,harlanhaskins/swift,nathawes/swift,djwbrown/swift,sschiau/swift,zisko/swift,parkera/swift,IngmarStein/swift,JaSpa/swift,danielmartin/swift,karwa/swift,deyton/swift,JaSpa/swift,dreamsxin/swift,benlangmuir/swift,swiftix/swift,manavgabhawala/swift,swiftix/swift,zisko/swift,amraboelela/swift,therealbnut/swift,allevato/swift,gregomni/swift,hooman/swift,lorentey/swift,shajrawi/swift,xedin/swift,tkremenek/swift,jmgc/swift,johnno1962d/swift,roambotics/swift,CodaFi/swift,KrishMunot/swift,nathawes/swift,austinzheng/swift,modocache/swift,gmilos/swift,frootloops/swift,modocache/swift,frootloops/swift,jmgc/swift,gregomni/swift,JGiola/swift,glessard/swift,kstaring/swift,JaSpa/swift,alblue/swift,amraboelela/swift,jtbandes/swift,JGiola/swift,parkera/swift,OscarSwanros/swift,calebd/swift,natecook1000/swift,tkremenek/swift,apple/swift,atrick/swift,danielmartin/swift,rudkx/swift,parkera/swift,shajrawi/swift,KrishMunot/swift,tinysun212/swift-windows,hughbe/swift,brentdax/swift,tjw/swift,ben-ng/swift,SwiftAndroid/swift,lorentey/swift,deyton/swift,tkremenek/swift,milseman/swift,austinzheng/swift,felix91gr/swift,practicalswift/swift,devincoughlin/swift,xedin/swift,djwbrown/swift,karwa/swift,frootloops/swift,shahmishal/swift,shahmishal/swift,ken0nek/swift,uasys/swift,benlangmuir/swift,gregomni/swift,milseman/swift,uasys/swift,natecook1000/swift,manavgabhawala/swift,tjw/swift,kperryua/swift,felix91gr/swift,arvedviehweger/swift,jopamer/swift,JaSpa/swift,kperryua/swift,danielmartin/swift,natecook1000/swift,benlangmuir/swift,CodaFi/swift,allevato/swift,ben-ng/swift,slavapestov/swift,gribozavr/swift,aschwaighofer/swift,gribozavr/swift,jtbandes/swift,allevato/swift,KrishMunot/swift,manavgabhawala/swift,jckarter/swift,sschiau/swift,arvedviehweger/swift,milseman/swift,frootloops/swift,stephentyrone/swift,johnno1962d/swift,hooman/swift,ahoppen/swift,airspeedswift/swift