qt6: set "moveToDev" to false

The qt build system locates header files, libraries and other installed
components with paths relative to the cmake files. Thus the default
behavior of moving them to the "dev" output breaks these expectations
and is now disabled.

pkgs/development/libraries/qt-6/modules/qtbase.nix

@@ -259,6 +259,8 @@ stdenv.mkDerivation rec {
     "bin/uic"
   ];
 
+  moveToDev = false;
+
   postFixup = ''
     moveToOutput "mkspecs"   "$dev"
     moveToOutput "modules"   "$dev"

pkgs/development/libraries/qt-6/qtModule.nix

@@ -26,6 +26,8 @@ stdenv.mkDerivation (args // {
   nativeBuildInputs = (args.nativeBuildInputs or [ ]) ++ [ cmake ninja perl ];
   propagatedBuildInputs = args.qtInputs ++ (args.propagatedBuildInputs or [ ]);
 
+  moveToDev = false;
+
   outputs = args.outputs or [ "out" "dev" ];
 
   dontWrapQtApps = args.dontWrapQtApps or true;