Reenable building all unit tests, which inadvertantly got disabled in an earlier commit.
Reenable building all unit tests, which inadvertantly got disabled in an earlier commit.

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40832

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