zookeeper_mt: add version

pkgs/development/libraries/zookeeper_mt/default.nix

···
 { stdenv, zookeeper, bash }:
 
 stdenv.mkDerivation rec {
-   name = "zookeeper_mt";
+   name = "zookeeper_mt-${stdenv.lib.getVersion zookeeper}";
    
    src = zookeeper.src;