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/tools/system/foremost/default.nix

@@ -1,8 +1,8 @@
 { stdenv, fetchurl }:
 
-let version = "1.5.7"; in
 stdenv.mkDerivation rec {
   name = "foremost-${version}";
+  version = "1.5.7";
 
   src = fetchurl {
     sha256 = "0d2zxw0ijg8cd3ksgm8cf8jg128zr5x7z779jar90g9f47pm882h";
@@ -20,7 +20,6 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    inherit version;
     description = "Recover files based on their contents";
     longDescription = ''
       Foremost is a console program to recover files based on their headers,