cfg: add three missing macros to qt.cfg (danmar#7582)

A small change adding three macros to qt.cfg

Three macros ussed for QML integration.
Q_IMPORT_QML_PLUGIN imports a qml plugin into the current excecutable.
This is usually only found in one cpp file.

Q_OBJECT_BINDABLE_PROPERTY registers a property inside a Q_OBJECT for
the QProperty binding system.

Author: CasparKielwein

AUTHORS

@@ -79,6 +79,7 @@ Carlos Gomes Martinho
 Carl-Oskar Larsson
 Cary Converse
 Cary R
+Caspar Kielwein
 Changkyoon Kim
 Chris Lalancette
 Christian Ehrlicher

cfg/qt.cfg

@@ -5451,6 +5451,11 @@
   <!-- https://doc.qt.io/qt-6/qqml-h-qtqml-proxy.html -->
   <define name="QML_DECLARE_TYPE" value=""/>
   <define name="QML_DECLARE_TYPEINFO(Type, Flags)" value=""/>
+  <!-- https://doc.qt.io/qt-6/qobjectbindableproperty.html -->
+  <define name="Q_OBJECT_BINDABLE_PROPERTY(containingClass, type, name, signal)" value=""/>
+  <define name="Q_OBJECT_BINDABLE_PROPERTY_WITH_ARGS(containingClass, type, name, initialvalue, signal)" value=""/>
+  <!-- https://doc.qt.io/qt-6/qqmlengineextensionplugin.html -->
+  <define name="Q_IMPORT_QML_PLUGIN(PluginName)" value=""/>
   <!-- https://doc.qt.io/qt-5/qstring.html#QStringLiteral -->
   <define name="QStringLiteral(str)" value="QString::fromUtf8(str, sizeof(str) - 1)"/>
   <define name="QByteArrayLiteral(str)" value="QByteArray(str)"/>