Part: fix regression by commit 289a9bcc8

* Standard_Version.hxx is required for the OCC version check macro
* group sorted header includes by library

src/Mod/Part/Gui/ViewProviderExt.cpp

@@ -36,9 +36,7 @@
 # include <Poly_Polygon3D.hxx>
 # include <Poly_PolygonOnTriangulation.hxx>
 # include <Poly_Triangulation.hxx>
-# include <QAction>
-# include <QMenu>
-# include <sstream>
+# include <Standard_Version.hxx>
 # include <TColgp_Array1OfDir.hxx>
 # include <TColgp_Array1OfPnt.hxx>
 # include <TColStd_Array1OfInteger.hxx>
@@ -51,6 +49,10 @@
 # include <TopoDS_Vertex.hxx>
 # include <TopTools_IndexedMapOfShape.hxx>
 
+# include <QAction>
+# include <QMenu>
+# include <sstream>
+
 # include <Inventor/SoPickedPoint.h>
 # include <Inventor/details/SoFaceDetail.h>
 # include <Inventor/details/SoLineDetail.h>