Forward declare QFileSystemWatcher

Change-Id: I9ddfe95ea9e0df31c6737e11fe7b4b095b594d18
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -62,6 +62,7 @@
 #include <QFormLayout>
 #include <QMainWindow>
 #include <QInputDialog>
+#include <QFileSystemWatcher>
 
 using namespace CMakeProjectManager;
 using namespace CMakeProjectManager::Internal;

src/plugins/cmakeprojectmanager/cmakeproject.h

@@ -48,10 +48,13 @@
 #include <coreplugin/editormanager/ieditor.h>
 
 #include <QXmlStreamReader>
-#include <QFileSystemWatcher>
 #include <QPushButton>
 #include <QLineEdit>
 
+QT_BEGIN_NAMESPACE
+class QFileSystemWatcher;
+QT_END_NAMESPACE
+
 namespace CMakeProjectManager {
 namespace Internal {