Add additional swiftc flags for adding the XCTest module path when configuring Foundation
Add additional swiftc flags for adding the XCTest module path when configuring Foundation

This allows for the unit tests to properly find the module map file for
XCTest; this requires Foundation commit 3effff to properly forward the
extra swiftc flags to building the unit tests.

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