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/tools/parsing/flexc++/default.nix

@@ -1,8 +1,8 @@
 { stdenv, fetchFromGitHub, bobcat, icmake, yodl }:
 
-let version = "2.03.00"; in
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "flexc++-${version}";
+  version = "2.03.00";
 
   src = fetchFromGitHub {
     sha256 = "1knb5h6l71n5zi9xzml5f6v7wspbk7vrcaiy2div8bnj7na3z717";
@@ -11,20 +11,6 @@ stdenv.mkDerivation {
     owner = "fbb-git";
   };
 
-  meta = with stdenv.lib; {
-    inherit version;
-    description = "C++ tool for generating lexical scanners";
-    longDescription = ''
-      Flexc++ was designed after `flex'. Flexc++ offers a cleaner class design
-      and requires simpler specification files than offered by flex's C++
-      option.
-    '';
-    homepage = https://fbb-git.github.io/flexcpp/;
-    license = licenses.gpl3;
-    platforms = platforms.linux;
-    maintainers = with maintainers; [ nckx ];
-  };
-
   sourceRoot = "flexcpp-${version}-src/flexc++";
 
   buildInputs = [ bobcat ];
@@ -48,4 +34,17 @@ stdenv.mkDerivation {
     ./build install skel
     ./build install std
   '';
+
+  meta = with stdenv.lib; {
+    description = "C++ tool for generating lexical scanners";
+    longDescription = ''
+      Flexc++ was designed after `flex'. Flexc++ offers a cleaner class design
+      and requires simpler specification files than offered by flex's C++
+      option.
+    '';
+    homepage = https://fbb-git.github.io/flexcpp/;
+    license = licenses.gpl3;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ nckx ];
+  };
 }