Fix encoding container linker errors
Fix encoding container linker errors

The box types were previously fileprivate because they lived in
the Foundation overlay. As part of the Swift stdlib, though, they need
to be internal so they can be linked against.

deyton/swift,calebd/swift,practicalswift/swift,jtbandes/swift,deyton/swift,hughbe/swift,sschiau/swift,apple/swift,parkera/swift,hughbe/swift,hughbe/swift,Jnosh/swift,calebd/swift,return/swift,austinzheng/swift,ahoppen/swift,jopamer/swift,nathawes/swift,hughbe/swift,hooman/swift,milseman/swift,amraboelela/swift,sschiau/swift,uasys/swift,roambotics/swift,danielmartin/swift,tjw/swift,rudkx/swift,gregomni/swift,gribozavr/swift,parkera/swift,xwu/swift,swiftix/swift,alblue/swift,roambotics/swift,airspeedswift/swift,huonw/swift,atrick/swift,harlanhaskins/swift,shajrawi/swift,swiftix/swift,stephentyrone/swift,gribozavr/swift,jckarter/swift,karwa/swift,nathawes/swift,airspeedswift/swift,shahmishal/swift,xedin/swift,devincoughlin/swift,atrick/swift,jtbandes/swift,milseman/swift,jckarter/swift,deyton/swift,OscarSwanros/swift,rudkx/swift,austinzheng/swift,gregomni/swift,gregomni/swift,gribozavr/swift,aschwaighofer/swift,zisko/swift,danielmartin/swift,rudkx/swift,tjw/swift,harlanhaskins/swift,benlangmuir/swift,austinzheng/swift,practicalswift/swift,huonw/swift,ahoppen/swift,jmgc/swift,atrick/swift,Jnosh/swift,allevato/swift,aschwaighofer/swift,JGiola/swift,JGiola/swift,shajrawi/swift,sschiau/swift,frootloops/swift,natecook1000/swift,tkremenek/swift,glessard/swift,amraboelela/swift,apple/swift,hughbe/swift,zisko/swift,amraboelela/swift,JGiola/swift,frootloops/swift,CodaFi/swift,aschwaighofer/swift,devincoughlin/swift,brentdax/swift,amraboelela/swift,xwu/swift,glessard/swift,airspeedswift/swift,shahmishal/swift,OscarSwanros/swift,jmgc/swift,roambotics/swift,practicalswift/swift,jopamer/swift,shahmishal/swift,tjw/swift,benlangmuir/swift,karwa/swift,apple/swift,felix91gr/swift,CodaFi/swift,parkera/swift,aschwaighofer/swift,lorentey/swift,practicalswift/swift,stephentyrone/swift,roambotics/swift,brentdax/swift,xedin/swift,JGiola/swift,jmgc/swift,felix91gr/swift,lorentey/swift,lorentey/swift,nathawes/swift,practicalswift/swift,jckarter/swift,jmgc/swift,stephentyrone/swift,parkera/swift,nathawes/swift,zisko/swift,shajrawi/swift,devincoughlin/swift,glessard/swift,huonw/swift,karwa/swift,danielmartin/swift,sschiau/swift,jmgc/swift,xwu/swift,djwbrown/swift,gregomni/swift,natecook1000/swift,tkremenek/swift,natecook1000/swift,calebd/swift,sschiau/swift,karwa/swift,benlangmuir/swift,djwbrown/swift,milseman/swift,shahmishal/swift,gregomni/swift,gregomni/swift,apple/swift,huonw/swift,jtbandes/swift,swiftix/swift,benlangmuir/swift,return/swift,allevato/swift,xedin/swift,glessard/swift,devincoughlin/swift,tkremenek/swift,allevato/swift,benlangmuir/swift,alblue/swift,shahmishal/swift,felix91gr/swift,uasys/swift,OscarSwanros/swift,xedin/swift,jopamer/swift,calebd/swift,stephentyrone/swift,roambotics/swift,aschwaighofer/swift,shajrawi/swift,allevato/swift,alblue/swift,deyton/swift,djwbrown/swift,shahmishal/swift,hooman/swift,xwu/swift,brentdax/swift,CodaFi/swift,felix91gr/swift,swiftix/swift,austinzheng/swift,karwa/swift,aschwaighofer/swift,Jnosh/swift,xwu/swift,CodaFi/swift,stephentyrone/swift,sschiau/swift,jckarter/swift,return/swift,jtbandes/swift,austinzheng/swift,danielmartin/swift,jopamer/swift,devincoughlin/swift,lorentey/swift,shahmishal/swift,natecook1000/swift,alblue/swift,OscarSwanros/swift,Jnosh/swift,felix91gr/swift,tkremenek/swift,jopamer/swift,swiftix/swift,jmgc/swift,tkremenek/swift,felix91gr/swift,uasys/swift,apple/swift,stephentyrone/swift,gribozavr/swift,allevato/swift,frootloops/swift,deyton/swift,milseman/swift,JGiola/swift,tkremenek/swift,natecook1000/swift,devincoughlin/swift,lorentey/swift,zisko/swift,hooman/swift,uasys/swift,hooman/swift,natecook1000/swift,nathawes/swift,tkremenek/swift,return/swift,parkera/swift,swiftix/swift,huonw/swift,shajrawi/swift,swiftix/swift,jmgc/swift,jtbandes/swift,natecook1000/swift,harlanhaskins/swift,huonw/swift,airspeedswift/swift,brentdax/swift,ahoppen/swift,benlangmuir/swift,shahmishal/swift,karwa/swift,apple/swift,practicalswift/swift,practicalswift/swift,lorentey/swift,gribozavr/swift,stephentyrone/swift,xwu/swift,karwa/swift,amraboelela/swift,Jnosh/swift,xedin/swift,harlanhaskins/swift,jtbandes/swift,djwbrown/swift,hooman/swift,milseman/swift,jopamer/swift,shajrawi/swift,jckarter/swift,xedin/swift,Jnosh/swift,OscarSwanros/swift,sschiau/swift,tjw/swift,zisko/swift,allevato/swift,devincoughlin/swift,return/swift,atrick/swift,practicalswift/swift,uasys/swift,huonw/swift,austinzheng/swift,xedin/swift,milseman/swift,gribozavr/swift,ahoppen/swift,harlanhaskins/swift,frootloops/swift,hughbe/swift,lorentey/swift,sschiau/swift,rudkx/swift,aschwaighofer/swift,deyton/swift,frootloops/swift,austinzheng/swift,gribozavr/swift,Jnosh/swift,nathawes/swift,danielmartin/swift,airspeedswift/swift,djwbrown/swift,tjw/swift,nathawes/swift,jckarter/swift,felix91gr/swift,alblue/swift,tjw/swift,karwa/swift,djwbrown/swift,calebd/swift,JGiola/swift,calebd/swift,harlanhaskins/swift,shajrawi/swift,alblue/swift,brentdax/swift,atrick/swift,shajrawi/swift,parkera/swift,CodaFi/swift,brentdax/swift,xedin/swift,jopamer/swift,xwu/swift,ahoppen/swift,hooman/swift,glessard/swift,hughbe/swift,OscarSwanros/swift,danielmartin/swift,roambotics/swift,amraboelela/swift,djwbrown/swift,gribozavr/swift,amraboelela/swift,parkera/swift,milseman/swift,rudkx/swift,CodaFi/swift,OscarSwanros/swift,atrick/swift,devincoughlin/swift,zisko/swift,alblue/swift,uasys/swift,hooman/swift,jckarter/swift,ahoppen/swift,frootloops/swift,glessard/swift,frootloops/swift,jtbandes/swift,brentdax/swift,zisko/swift,lorentey/swift,airspeedswift/swift,rudkx/swift,danielmartin/swift,return/swift,uasys/swift,allevato/swift,tjw/swift,calebd/swift,airspeedswift/swift,CodaFi/swift,harlanhaskins/swift,deyton/swift,parkera/swift,return/swift