Android: Compile fix for namespaced Qt

Change-Id: Iaf09e3528a6aceabe631aa7b53441ea940cc645b
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/android/androidmanager.h

@@ -37,7 +37,9 @@
 #include <QObject>
 #include <QStringList>
 
+QT_BEGIN_NAMESPACE
 class QDomDocument;
+QT_END_NAMESPACE
 
 namespace ProjectExplorer {
 class Kit;