qt6Packages: add aliases for dropped packages

Author: wineee

pkgs/top-level/qt6-packages.nix

@@ -147,5 +147,15 @@ makeScopeWithSplicing' {
 
       wayqt = callPackage ../development/libraries/wayqt { };
     }
+    // lib.optionalAttrs config.allowAliases {
+      qwlroots = throw ''
+        'qt6Packages.qwlroots' has been removed because it has been merged into treeland upstream.
+        The upstream no longer provides it as a standalone development library.
+      ''; # Added 2025-02-07
+      waylib = throw ''
+        'qt6Packages.waylib' has been removed because it has been merged into treeland upstream.
+        The upstream no longer provides it as a standalone development library.
+      ''; # Added 2025-02-07
+    }
   );
 }