[build-script] Fix issue with DOTEST_ARGS for LLDB.
[build-script] Fix issue with DOTEST_ARGS for LLDB.

LLDB expects the DOTEST_ARGS CMake variable to be a list with entries
separated by semicolons.

(cherry picked from commit 1544a4718e10eedd125953ca0b30896b6d158fb2)

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