Only configure swift-reflection-dump if the host stdlib is requested
Only configure swift-reflection-dump if the host stdlib is requested

Since swift-reflection-dump is a host-only tool, for iOS-only builds or
other builds where the host SDK isn't configured and the standard
library isn't building, the swift-reflection-dump tool will fail to find
libswiftReflection.

rdar://problem/25858390

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