Add version attribute where maintainers |= nckx

This will probably be mandatory soon, and is a step in the right
direction. Removes the deprecated meta.version, and move some meta
sections to the end of the file where I should have put them in
the first place.

pkgs/development/libraries/libcli/default.nix

@@ -1,8 +1,8 @@
 { stdenv, fetchFromGitHub }:
 
-let version = "1.9.7"; in
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "libcli-${version}";
+  version = "1.9.7";
 
   src = fetchFromGitHub {
     sha256 = "08pmjhqkwldhmcwjhi2l27slf1fk6nxxfaihnk2637pqkycy8z0c";