[CMake] Don't use the shims/ directory as a primary output.
[CMake] Don't use the shims/ directory as a primary output.

CMake uses the first output in a multi-output command to trigger rebuilds
by removing it with "rm -f", but doing this with a directory can cause
problems. Hopefully this will fix the issue.

Swift SVN r25046

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