wafHook: Refactored wafHook to use callPackage (#64250)

This is to enable custom wafHook with custom waf via the override
system.

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

@@ -0,0 +1,10 @@
+{ lib, stdenv, pkgs, python, makeSetupHook, waf }:
+
+makeSetupHook {
+  deps = [ python ];
+  substitutions = {
+    inherit waf;
+    crossFlags = lib.optionalString (stdenv.hostPlatform.system != stdenv.targetPlatform.system)
+      ''--cross-compile "--cross-execute=${stdenv.targetPlatform.emulator pkgs}"'';
+  };
+} ./setup-hook.sh

pkgs/top-level/all-packages.nix

@@ -6770,14 +6770,7 @@ in
   volumeicon = callPackage ../tools/audio/volumeicon { };
 
   waf = callPackage ../development/tools/build-managers/waf { python = python3; };
-  wafHook = makeSetupHook {
+  wafHook = callPackage ../development/tools/build-managers/wafHook { };
-    deps = [ python ];
-    substitutions = {
-      inherit waf;
-      crossFlags = lib.optionalString (stdenv.hostPlatform.system != stdenv.targetPlatform.system)
-        ''--cross-compile "--cross-execute=${stdenv.targetPlatform.emulator pkgs}"'';
-    };
-  } ../development/tools/build-managers/waf/setup-hook.sh;
 
   wakelan = callPackage ../tools/networking/wakelan { };