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/analysis/include-what-you-use/default.nix

@@ -1,9 +1,9 @@
 { stdenv, fetchurl, cmake, llvmPackages }:
 
-# Also bump llvmPackages in all-packages.nix to the supported version!
-let version = "0.5"; in
 stdenv.mkDerivation rec {
   name = "include-what-you-use-${version}";
+  # Also bump llvmPackages in all-packages.nix to the supported version!
+  version = "0.5";
 
   src = fetchurl {
     sha256 = "19pwhgwvfr86n8ks099p9r02v7zh8d3qs7g7snzkhpdgq1azww85";
@@ -18,7 +18,6 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   meta = with stdenv.lib; {
-    inherit version;
     description = "Analyze #includes in C/C++ source files with clang";
     longDescription = ''
       For every symbol (type, function variable, or macro) that you use in