Use __thrust_hd_warning_disable__ in distance's implementation to avoid warnings when operating on external iterators.
Use __thrust_hd_warning_disable__ in distance's implementation to avoid
warnings when operating on external iterators.

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