added missing file: host/unique.h
added missing file: host/unique.h

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40671

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