Fix broken unit test build.
Fix broken unit test build.

Ricardo666666/thrust,GrimDerp/thrust,mohamed-ali/thrust,GrimDerp/thrust,zeryx/thrust,andrewcorrigan/thrust-multi-permutation-iterator,zhenglaizhang/thrust,arnabgho/thrust,raygit/thrust,xiongzhanblake/thrust_src,thvasilo/thrust,thvasilo/thrust,thvasilo/thrust,zhenglaizhang/thrust,andrewcorrigan/thrust-multi-permutation-iterator,xiongzhanblake/thrust_src,jaredhoberock/thrust,egaburov/thrust,zeryx/thrust,marksantos/thrust,jaredhoberock/thrust,zhenglaizhang/thrust,xiongzhanblake/thrust,jaredhoberock/thrust,marksantos/thrust,dachziegel/thrust,sdalton1/thrust,xiongzhanblake/thrust,Ricardo666666/thrust,raygit/thrust,andrewcorrigan/thrust-multi-permutation-iterator,Ricardo666666/thrust,dachziegel/thrust,raygit/thrust,thrust/thrust,egaburov/thrust,sdalton1/thrust,thrust/thrust,xiongzhanblake/thrust_src,arnabgho/thrust,sdalton1/thrust,zeryx/thrust,thrust/thrust,marksantos/thrust,GrimDerp/thrust,egaburov/thrust,thrust/thrust,sarvex/thrust,xiongzhanblake/thrust,sarvex/thrust,arnabgho/thrust,jaredhoberock/thrust,thrust/thrust,sarvex/thrust,dachziegel/thrust,jaredhoberock/thrust,mohamed-ali/thrust,mohamed-ali/thrust