QML Designer: Link qtquickplugin against QtQml

Otherwise you cannot use the qtquickcompiler.

Fixes: QTBUG-80470
Change-Id: I6f03dddb79d17ee8a784831b91e46910909e3ec4
Reviewed-by: Liang Qi <liang.qi@qt.io>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/qtquickplugin/qtquickplugin.pro

@@ -1,3 +1,5 @@
+QT += qml
+
 include(../../../../qtcreator.pri)\
 include(qtquickplugin.pri)
 include(../plugindestdir.pri)

src/plugins/qmldesigner/qtquickplugin/qtquickplugin.qbs

@@ -6,6 +6,8 @@ QtcProduct {
     installDir: qtc.ide_plugin_path + '/' + installDirName
     property string installDirName: qbs.targetOS.contains("macos") ? "QmlDesigner" : "qmldesigner"
 
+    Depends { name: "Qt.qml" }
+
     cpp.defines: base.concat("QTQUICK_LIBRARY")
     cpp.includePaths: base.concat("../designercore/include")
     Properties {