Test host_system_tag rather than cpp::tag
Test host_system_tag rather than cpp::tag

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