wafHook: assimilated under waf.passthru.hook

pkgs/development/tools/build-managers/waf/default.nix

···
 { lib
 , stdenv
 , fetchFromGitLab
+, callPackage
 , ensureNewerSourcesForZipFilesHook
 , python3
 # optional list of extra waf tools, e.g. `[ "doxygen" "pytest" ]`
···
 
     runHook postInstall
   '';
+
+  passthru = {
+    inherit python3 extraTools;
+    hook = callPackage ./hook.nix {
+      waf = finalAttrs.finalPackage;
+    };
+  };
 
   meta = {
     homepage = "https://waf.io";

pkgs/top-level/all-packages.nix

···
   volumeicon = callPackage ../tools/audio/volumeicon { };
 
   waf = callPackage ../development/tools/build-managers/waf { };
-  wafHook = callPackage ../development/tools/build-managers/waf/hook.nix { };
+  wafHook = waf.hook;
 
   waf-tester = callPackage ../tools/security/waf-tester { };