Eliminate unused variable from vector_base.inl
Eliminate unused variable from vector_base.inl

Fixes issue 12

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