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/graphics/apitrace/default.nix

@@ -1,8 +1,8 @@
 { stdenv, fetchFromGitHub, cmake, libX11, procps, python, qtbase }:
 
-let version = "7.1"; in
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "apitrace-${version}";
+  version = "7.1";
 
   src = fetchFromGitHub {
     sha256 = "1n2gmsjnpyam7isg7n1ksggyh6y1l8drvx0a93bnvbcskr7jiz9a";
@@ -20,7 +20,6 @@ stdenv.mkDerivation {
   '';
 
   meta = with stdenv.lib; {
-    inherit version;
     homepage = https://apitrace.github.io;
     description = "Tools to trace OpenGL, OpenGL ES, Direct3D, and DirectDraw APIs";
     license = licenses.mit;