[driver] Use the target triple's OS version as the linker's min OS version.
[driver] Use the target triple's OS version as the linker's min OS version.

This only affects binaries built from the command line. Xcode isn't using
the driver to invoke ld.

Swift SVN r17822

dduan/swift,ken0nek/swift,milseman/swift,roambotics/swift,Ivacker/swift,shahmishal/swift,calebd/swift,Jnosh/swift,amraboelela/swift,JGiola/swift,tardieu/swift,rudkx/swift,kperryua/swift,SwiftAndroid/swift,djwbrown/swift,shahmishal/swift,gottesmm/swift,kstaring/swift,xedin/swift,sdulal/swift,natecook1000/swift,KrishMunot/swift,bitjammer/swift,benlangmuir/swift,ben-ng/swift,harlanhaskins/swift,jopamer/swift,hughbe/swift,xwu/swift,swiftix/swift.old,lorentey/swift,austinzheng/swift,kentya6/swift,glessard/swift,danielmartin/swift,milseman/swift,xedin/swift,frootloops/swift,Ivacker/swift,gmilos/swift,manavgabhawala/swift,tkremenek/swift,benlangmuir/swift,OscarSwanros/swift,stephentyrone/swift,sschiau/swift,practicalswift/swift,OscarSwanros/swift,modocache/swift,Jnosh/swift,kentya6/swift,therealbnut/swift,lorentey/swift,zisko/swift,emilstahl/swift,jtbandes/swift,ben-ng/swift,huonw/swift,russbishop/swift,zisko/swift,frootloops/swift,roambotics/swift,uasys/swift,JGiola/swift,harlanhaskins/swift,gottesmm/swift,tjw/swift,allevato/swift,swiftix/swift,xwu/swift,ben-ng/swift,IngmarStein/swift,zisko/swift,tinysun212/swift-windows,alblue/swift,lorentey/swift,felix91gr/swift,tardieu/swift,xedin/swift,kperryua/swift,therealbnut/swift,calebd/swift,deyton/swift,johnno1962d/swift,sschiau/swift,huonw/swift,SwiftAndroid/swift,devincoughlin/swift,aschwaighofer/swift,djwbrown/swift,emilstahl/swift,LeoShimonaka/swift,adrfer/swift,Ivacker/swift,devincoughlin/swift,OscarSwanros/swift,gregomni/swift,benlangmuir/swift,milseman/swift,uasys/swift,ahoppen/swift,brentdax/swift,shajrawi/swift,roambotics/swift,practicalswift/swift,jopamer/swift,tjw/swift,xwu/swift,calebd/swift,natecook1000/swift,djwbrown/swift,glessard/swift,JaSpa/swift,gregomni/swift,therealbnut/swift,danielmartin/swift,practicalswift/swift,swiftix/swift,tkremenek/swift,gmilos/swift,tinysun212/swift-windows,codestergit/swift,KrishMunot/swift,kentya6/swift,rudkx/swift,arvedviehweger/swift,bitjammer/swift,russbishop/swift,deyton/swift,calebd/swift,harlanhaskins/swift,hooman/swift,SwiftAndroid/swift,rudkx/swift,swiftix/swift.old,JaSpa/swift,johnno1962d/swift,manavgabhawala/swift,frootloops/swift,sdulal/swift,swiftix/swift.old,CodaFi/swift,gribozavr/swift,KrishMunot/swift,austinzheng/swift,brentdax/swift,airspeedswift/swift,swiftix/swift,JaSpa/swift,Jnosh/swift,brentdax/swift,devincoughlin/swift,khizkhiz/swift,stephentyrone/swift,nathawes/swift,karwa/swift,tinysun212/swift-windows,kentya6/swift,dduan/swift,apple/swift,modocache/swift,kperryua/swift,natecook1000/swift,slavapestov/swift,gribozavr/swift,CodaFi/swift,karwa/swift,arvedviehweger/swift,atrick/swift,emilstahl/swift,MukeshKumarS/Swift,ken0nek/swift,apple/swift,codestergit/swift,jtbandes/swift,kperryua/swift,gribozavr/swift,glessard/swift,SwiftAndroid/swift,allevato/swift,CodaFi/swift,hughbe/swift,apple/swift,devincoughlin/swift,hughbe/swift,sschiau/swift,IngmarStein/swift,nathawes/swift,sdulal/swift,slavapestov/swift,frootloops/swift,johnno1962d/swift,parkera/swift,cbrentharris/swift,hooman/swift,sschiau/swift,return/swift,gribozavr/swift,alblue/swift,dreamsxin/swift,aschwaighofer/swift,shahmishal/swift,huonw/swift,russbishop/swift,Jnosh/swift,milseman/swift,kusl/swift,JGiola/swift,frootloops/swift,return/swift,therealbnut/swift,ahoppen/swift,benlangmuir/swift,atrick/swift,djwbrown/swift,manavgabhawala/swift,austinzheng/swift,return/swift,benlangmuir/swift,kstaring/swift,djwbrown/swift,hooman/swift,stephentyrone/swift,gmilos/swift,jmgc/swift,tinysun212/swift-windows,KrishMunot/swift,swiftix/swift.old,SwiftAndroid/swift,slavapestov/swift,mightydeveloper/swift,russbishop/swift,allevato/swift,ben-ng/swift,gregomni/swift,adrfer/swift,shahmishal/swift,jckarter/swift,OscarSwanros/swift,ben-ng/swift,karwa/swift,MukeshKumarS/Swift,slavapestov/swift,rudkx/swift,harlanhaskins/swift,gribozavr/swift,ahoppen/swift,allevato/swift,khizkhiz/swift,tkremenek/swift,tkremenek/swift,zisko/swift,karwa/swift,felix91gr/swift,gottesmm/swift,bitjammer/swift,felix91gr/swift,swiftix/swift,jmgc/swift,dreamsxin/swift,tjw/swift,parkera/swift,IngmarStein/swift,MukeshKumarS/Swift,zisko/swift,jmgc/swift,gribozavr/swift,CodaFi/swift,karwa/swift,bitjammer/swift,danielmartin/swift,slavapestov/swift,cbrentharris/swift,roambotics/swift,CodaFi/swift,kentya6/swift,kentya6/swift,brentdax/swift,slavapestov/swift,hughbe/swift,danielmartin/swift,huonw/swift,natecook1000/swift,jckarter/swift,deyton/swift,glessard/swift,SwiftAndroid/swift,brentdax/swift,practicalswift/swift,kstaring/swift,lorentey/swift,harlanhaskins/swift,MukeshKumarS/Swift,ahoppen/swift,alblue/swift,tinysun212/swift-windows,Jnosh/swift,xedin/swift,stephentyrone/swift,manavgabhawala/swift,codestergit/swift,kstaring/swift,cbrentharris/swift,therealbnut/swift,Jnosh/swift,uasys/swift,sschiau/swift,aschwaighofer/swift,slavapestov/swift,sschiau/swift,calebd/swift,jopamer/swift,shahmishal/swift,jopamer/swift,devincoughlin/swift,gribozavr/swift,Ivacker/swift,stephentyrone/swift,kusl/swift,therealbnut/swift,swiftix/swift.old,austinzheng/swift,frootloops/swift,gottesmm/swift,kstaring/swift,JaSpa/swift,jmgc/swift,felix91gr/swift,arvedviehweger/swift,tjw/swift,uasys/swift,sschiau/swift,natecook1000/swift,hughbe/swift,LeoShimonaka/swift,adrfer/swift,natecook1000/swift,lorentey/swift,kstaring/swift,JaSpa/swift,lorentey/swift,KrishMunot/swift,LeoShimonaka/swift,alblue/swift,jmgc/swift,adrfer/swift,gmilos/swift,tardieu/swift,gottesmm/swift,ahoppen/swift,aschwaighofer/swift,khizkhiz/swift,apple/swift,IngmarStein/swift,shajrawi/swift,return/swift,modocache/swift,LeoShimonaka/swift,modocache/swift,mightydeveloper/swift,ben-ng/swift,tkremenek/swift,practicalswift/swift,codestergit/swift,lorentey/swift,natecook1000/swift,dduan/swift,bitjammer/swift,danielmartin/swift,sdulal/swift,aschwaighofer/swift,JGiola/swift,shajrawi/swift,deyton/swift,nathawes/swift,airspeedswift/swift,amraboelela/swift,adrfer/swift,karwa/swift,benlangmuir/swift,jopamer/swift,tkremenek/swift,practicalswift/swift,stephentyrone/swift,harlanhaskins/swift,CodaFi/swift,airspeedswift/swift,jmgc/swift,JGiola/swift,mightydeveloper/swift,arvedviehweger/swift,russbishop/swift,aschwaighofer/swift,allevato/swift,modocache/swift,cbrentharris/swift,dduan/swift,jmgc/swift,khizkhiz/swift,emilstahl/swift,xedin/swift,bitjammer/swift,shajrawi/swift,swiftix/swift,atrick/swift,hughbe/swift,airspeedswift/swift,gribozavr/swift,xwu/swift,LeoShimonaka/swift,jtbandes/swift,khizkhiz/swift,deyton/swift,allevato/swift,milseman/swift,sdulal/swift,return/swift,tjw/swift,jckarter/swift,austinzheng/swift,kusl/swift,milseman/swift,kusl/swift,emilstahl/swift,kusl/swift,Jnosh/swift,manavgabhawala/swift,allevato/swift,swiftix/swift,roambotics/swift,tardieu/swift,zisko/swift,manavgabhawala/swift,gottesmm/swift,stephentyrone/swift,rudkx/swift,jtbandes/swift,jckarter/swift,roambotics/swift,arvedviehweger/swift,uasys/swift,felix91gr/swift,ken0nek/swift,therealbnut/swift,gmilos/swift,airspeedswift/swift,jtbandes/swift,IngmarStein/swift,emilstahl/swift,tinysun212/swift-windows,gmilos/swift,russbishop/swift,glessard/swift,nathawes/swift,Ivacker/swift,calebd/swift,LeoShimonaka/swift,gottesmm/swift,ahoppen/swift,practicalswift/swift,alblue/swift,cbrentharris/swift,jopamer/swift,karwa/swift,shajrawi/swift,codestergit/swift,danielmartin/swift,jtbandes/swift,sdulal/swift,glessard/swift,dduan/swift,LeoShimonaka/swift,hooman/swift,ken0nek/swift,jckarter/swift,kperryua/swift,mightydeveloper/swift,amraboelela/swift,tardieu/swift,parkera/swift,russbishop/swift,ben-ng/swift,khizkhiz/swift,LeoShimonaka/swift,mightydeveloper/swift,zisko/swift,deyton/swift,shajrawi/swift,airspeedswift/swift,codestergit/swift,MukeshKumarS/Swift,KrishMunot/swift,austinzheng/swift,parkera/swift,mightydeveloper/swift,MukeshKumarS/Swift,xedin/swift,atrick/swift,huonw/swift,harlanhaskins/swift,djwbrown/swift,johnno1962d/swift,johnno1962d/swift,jtbandes/swift,mightydeveloper/swift,SwiftAndroid/swift,bitjammer/swift,Ivacker/swift,shahmishal/swift,amraboelela/swift,OscarSwanros/swift,johnno1962d/swift,khizkhiz/swift,calebd/swift,JaSpa/swift,hughbe/swift,CodaFi/swift,karwa/swift,hooman/swift,modocache/swift,hooman/swift,tkremenek/swift,tardieu/swift,danielmartin/swift,xwu/swift,cbrentharris/swift,felix91gr/swift,kentya6/swift,kusl/swift,hooman/swift,adrfer/swift,swiftix/swift.old,codestergit/swift,jopamer/swift,arvedviehweger/swift,jckarter/swift,rudkx/swift,return/swift,alblue/swift,arvedviehweger/swift,tjw/swift,swiftix/swift.old,parkera/swift,parkera/swift,xedin/swift,return/swift,apple/swift,Ivacker/swift,sschiau/swift,parkera/swift,Ivacker/swift,KrishMunot/swift,amraboelela/swift,JaSpa/swift,cbrentharris/swift,xedin/swift,tjw/swift,nathawes/swift,devincoughlin/swift,milseman/swift,tinysun212/swift-windows,apple/swift,alblue/swift,MukeshKumarS/Swift,lorentey/swift,nathawes/swift,aschwaighofer/swift,shahmishal/swift,djwbrown/swift,ken0nek/swift,kentya6/swift,modocache/swift,deyton/swift,emilstahl/swift,frootloops/swift,airspeedswift/swift,dduan/swift,kusl/swift,huonw/swift,kstaring/swift,shajrawi/swift,gmilos/swift,IngmarStein/swift,devincoughlin/swift,uasys/swift,cbrentharris/swift,parkera/swift,dduan/swift,sdulal/swift,adrfer/swift,uasys/swift,tardieu/swift,swiftix/swift,felix91gr/swift,gregomni/swift,JGiola/swift,amraboelela/swift,jckarter/swift,shajrawi/swift,johnno1962d/swift,xwu/swift,gregomni/swift,OscarSwanros/swift,kusl/swift,huonw/swift,ken0nek/swift,brentdax/swift,shahmishal/swift,manavgabhawala/swift,austinzheng/swift,atrick/swift,devincoughlin/swift,mightydeveloper/swift,OscarSwanros/swift,xwu/swift,kperryua/swift,emilstahl/swift,swiftix/swift.old,ken0nek/swift,nathawes/swift,amraboelela/swift,gregomni/swift,brentdax/swift,kperryua/swift,atrick/swift,IngmarStein/swift,sdulal/swift,practicalswift/swift