QmlDesigner: compile fix for share qmlpuppet and Qt 5.1

DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x040900

This ensures that QWeakPointer(const QObject *other)
does not get ambiguous with Qt 5.1.

Change-Id: I4801dbbc0ca4a3779b06d388f6a4251399f3e14b
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

share/qtcreator/qml/qmlpuppet/qmlpuppet/qmlpuppet.pro

@@ -9,4 +9,8 @@ build_all:!build_pass {
     CONFIG += release
 }
 
-include(../../../../../share/qtcreator/qml/qmlpuppet/qmlpuppet/qmlpuppet.pri)
\ No newline at end of file
+greaterThan(QT_MAJOR_VERSION, 4) {
+    DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x040900
+}
+
+include(qmlpuppet.pri)
\ No newline at end of file