Linux build fix: libxml isn't used for XML validation on Linux bots
Linux build fix: libxml isn't used for XML validation on Linux bots

This was causing some noise on the Linux bots and the other check
lines don't look for XML validation, although we may want to turn
on this check in the future.

rdar://problem/23394719

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