scripts: factor out benchmarks and run further with ./eeval and common_bench_cmd

rungdb

@@ -89,6 +89,4 @@ ${brk} \
 ${lx_symbols} \
 "
 fi
-cmd="$cmd $after"
-echo "$cmd" | tee "${out_arch_dir}/rungdb.sh"
-eval "$cmd"
+./eeval "$cmd $after" "${out_arch_dir}/rungdb.sh"