Add missing includes for QPointer

qtbase removed some indirect include somewhere.

Change-Id: I477e6dccebda4fbb81f6fffd179115840c67002f
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/coreplugin/locator/commandlocator.cpp

@@ -8,6 +8,7 @@
 #include <utils/stringutils.h>
 
 #include <QAction>
+#include <QPointer>
 
 using namespace Utils;
 

src/plugins/qmlprojectmanager/qmlproject.h

@@ -7,6 +7,8 @@
 #include "qmlprojectmanager_global.h"
 #include <projectexplorer/project.h>
 
+#include <QPointer>
+
 namespace QmlProjectManager {
 
 class QmlProject;

src/shared/qtsingleapplication/qtsingleapplication.cpp

@@ -7,6 +7,7 @@
 #include <QDir>
 #include <QFileOpenEvent>
 #include <QLockFile>
+#include <QPointer>
 #include <QSharedMemory>
 #include <QWidget>