Qt5 fix the clang plugin build

... and fix the global Qt* and wrong included headers.

Change-Id: I436628d3a2d4469d5cc72f9fe7f394426d86fb2e
Reviewed-on: https://gerrit.libreoffice.org/65023
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>

vcl/inc/qt5/Qt5Frame.hxx

@@ -158,7 +158,7 @@ public:
     virtual void SetPointer(PointerStyle ePointerStyle) override;
     virtual void CaptureMouse(bool bMouse) override;
     virtual void SetPointerPos(long nX, long nY) override;
-    virtual bool ShowTooltip(const OUString& rText, const tools::Rectangle& rHelpArea);
+    virtual bool ShowTooltip(const OUString& rText, const tools::Rectangle& rHelpArea) override;
     using SalFrame::Flush;
     virtual void Flush() override;
     virtual void SetInputContext(SalInputContext* pContext) override;

vcl/inc/qt5/Qt5Widget.hxx

@@ -60,7 +60,7 @@ class Qt5Widget : public QWidget
     const QString m_InternalMimeType = "application/x-libreoffice-dnditem";
 
 public slots:
-    void showTooltip(const OUString& rTip);
+    static void showTooltip(const OUString& rTip);
 
 public:
     Qt5Widget(Qt5Frame& rFrame, Qt::WindowFlags f = Qt::WindowFlags());

vcl/qt5/Qt5Widget.cxx

@@ -24,7 +24,8 @@
 #include <Qt5Graphics.hxx>
 #include <Qt5Tools.hxx>
 
-#include <QtCore/QtGlobal>
+#include <QtCore/QMimeData>
+#include <QtGui/QDrag>
 #include <QtGui/QFocusEvent>
 #include <QtGui/QImage>
 #include <QtGui/QKeyEvent>
@@ -33,10 +34,10 @@
 #include <QtGui/QPaintEvent>
 #include <QtGui/QResizeEvent>
 #include <QtGui/QShowEvent>
-#include <QtGui/QToolTip>
 #include <QtGui/QWheelEvent>
-#include <QtWidgets/QtWidgets>
 #include <QtWidgets/QMainWindow>
+#include <QtWidgets/QToolTip>
+#include <QtWidgets/QWidget>
 
 #include <cairo.h>
 #include <headless/svpgdi.hxx>