added a smart Eigen include to random_benchmark
added a smart Eigen include to random_benchmark

FALCONN-LIB/FALCONN,ilyaraz/FALCONN,ilyaraz/falconn_polygon,ilyaraz/FALCONN,ilyaraz/falconn_polygon,FALCONN-LIB/FALCONN,FALCONN-LIB/FALCONN,ilyaraz/falconn_polygon,ilyaraz/FALCONN,ilyaraz/falconn_polygon,ilyaraz/FALCONN,FALCONN-LIB/FALCONN