[windows] Add folder to path while testing.
[windows] Add folder to path while testing.

Some DLL are not installed, since they are only used for testing, but
they need to be in the PATH to allow some test binaries to execute
properly.

allevato/swift,ahoppen/swift,tkremenek/swift,glessard/swift,stephentyrone/swift,hooman/swift,allevato/swift,lorentey/swift,xwu/swift,rudkx/swift,stephentyrone/swift,JGiola/swift,roambotics/swift,xwu/swift,parkera/swift,CodaFi/swift,benlangmuir/swift,atrick/swift,airspeedswift/swift,benlangmuir/swift,rudkx/swift,gribozavr/swift,gribozavr/swift,apple/swift,parkera/swift,glessard/swift,jmgc/swift,benlangmuir/swift,airspeedswift/swift,lorentey/swift,gregomni/swift,nathawes/swift,nathawes/swift,xwu/swift,roambotics/swift,hooman/swift,glessard/swift,rudkx/swift,jmgc/swift,karwa/swift,aschwaighofer/swift,JGiola/swift,ahoppen/swift,airspeedswift/swift,gribozavr/swift,parkera/swift,lorentey/swift,rudkx/swift,lorentey/swift,apple/swift,karwa/swift,roambotics/swift,harlanhaskins/swift,stephentyrone/swift,JGiola/swift,xwu/swift,apple/swift,aschwaighofer/swift,aschwaighofer/swift,jmgc/swift,tkremenek/swift,airspeedswift/swift,harlanhaskins/swift,karwa/swift,nathawes/swift,airspeedswift/swift,allevato/swift,apple/swift,jckarter/swift,benlangmuir/swift,CodaFi/swift,parkera/swift,lorentey/swift,allevato/swift,lorentey/swift,hooman/swift,jckarter/swift,stephentyrone/swift,gribozavr/swift,parkera/swift,JGiola/swift,benlangmuir/swift,tkremenek/swift,parkera/swift,CodaFi/swift,gregomni/swift,atrick/swift,CodaFi/swift,nathawes/swift,jmgc/swift,atrick/swift,lorentey/swift,gregomni/swift,allevato/swift,tkremenek/swift,aschwaighofer/swift,xwu/swift,harlanhaskins/swift,xwu/swift,roambotics/swift,nathawes/swift,karwa/swift,atrick/swift,gribozavr/swift,apple/swift,tkremenek/swift,ahoppen/swift,rudkx/swift,JGiola/swift,gregomni/swift,parkera/swift,allevato/swift,lorentey/swift,airspeedswift/swift,jckarter/swift,gregomni/swift,hooman/swift,benlangmuir/swift,gribozavr/swift,nathawes/swift,ahoppen/swift,aschwaighofer/swift,jckarter/swift,airspeedswift/swift,nathawes/swift,xwu/swift,stephentyrone/swift,atrick/swift,CodaFi/swift,jmgc/swift,hooman/swift,CodaFi/swift,karwa/swift,jckarter/swift,karwa/swift,jmgc/swift,karwa/swift,parkera/swift,roambotics/swift,glessard/swift,harlanhaskins/swift,harlanhaskins/swift,gregomni/swift,JGiola/swift,ahoppen/swift,CodaFi/swift,aschwaighofer/swift,tkremenek/swift,glessard/swift,jckarter/swift,rudkx/swift,harlanhaskins/swift,ahoppen/swift,harlanhaskins/swift,jmgc/swift,atrick/swift,jckarter/swift,stephentyrone/swift,hooman/swift,karwa/swift,hooman/swift,aschwaighofer/swift,apple/swift,stephentyrone/swift,roambotics/swift,gribozavr/swift,allevato/swift,tkremenek/swift,glessard/swift,gribozavr/swift