Add missing QDebug include in qwiniconloader.cpp

Needed for qWarning().

Change-Id: Ibc9ea41942e1412770a403bcc11419551586b2f6
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>

src/imports/winextras/qwiniconloader.cpp

@@ -51,6 +51,7 @@
 #include <QQuickImageProvider>
 #include <QQmlFile>
 #include <qt_windows.h>
+#include <QDebug>
 
 QT_BEGIN_NAMESPACE