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/applications/video/clipgrab/default.nix

@@ -1,8 +1,8 @@
 { stdenv, fetchurl, makeDesktopItem, ffmpeg, qt4 }:
 
-let version = "3.5.6"; in
 stdenv.mkDerivation rec {
   name = "clipgrab-${version}";
+  version = "3.5.6";
 
   src = fetchurl {
     sha256 = "0wm6hqaq6ydbvvd0fqkfydxd5h7gf4di7lvq63xgxl4z40jqc25n";
@@ -41,7 +41,6 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    inherit version;
     description = "Video downloader for YouTube and other sites";
     longDescription = ''
       ClipGrab is a free downloader and converter for YouTube, Vimeo, Metacafe,