ClangImporter.cpp: Fix compilation on some linux systems
ClangImporter.cpp: Fix compilation on some linux systems

benlangmuir/swift,roambotics/swift,JGiola/swift,JGiola/swift,ahoppen/swift,glessard/swift,roambotics/swift,glessard/swift,ahoppen/swift,ahoppen/swift,ahoppen/swift,roambotics/swift,apple/swift,JGiola/swift,apple/swift,JGiola/swift,glessard/swift,benlangmuir/swift,apple/swift,roambotics/swift,benlangmuir/swift,JGiola/swift,ahoppen/swift,benlangmuir/swift,JGiola/swift,ahoppen/swift,glessard/swift,benlangmuir/swift,glessard/swift,glessard/swift,apple/swift,apple/swift,apple/swift,roambotics/swift,benlangmuir/swift,roambotics/swift