build-script: allow specifying the compiler version from a preset
build-script: allow specifying the compiler version from a preset

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