fix Sketcher build failure

src/Mod/Sketcher/Gui/PreCompiled.h

@@ -120,6 +120,7 @@
 #include <Inventor/elements/SoViewVolumeElement.h>
 #include <Inventor/elements/SoViewportRegionElement.h>
 #include <Inventor/nodes/SoCamera.h>
+#include <Inventor/nodes/SoInfo.h>
 #include <Inventor/SbTime.h>
 
 // Python

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -57,7 +57,6 @@
 # include <Inventor/nodes/SoPickStyle.h>
 # include <Inventor/nodes/SoCamera.h>
 # include <Inventor/SbTime.h>
-# include <Gui/Inventor/SmSwitchboard.h>
 
 /// Qt Include Files
 # include <QAction>
@@ -103,6 +102,7 @@
 #include <Gui/SoFCBoundingBox.h>
 #include <Gui/SoFCUnifiedSelection.h>
 #include <Gui/Inventor/MarkerBitmaps.h>
+#include <Gui/Inventor/SmSwitchboard.h>
 
 #include <Mod/Part/App/Geometry.h>
 #include <Mod/Part/App/BodyBase.h>

src/Mod/Sketcher/Gui/ViewProviderSketch.h

@@ -50,6 +50,7 @@ class SoPointSet;
 class SoTransform;
 class SoLineSet;
 class SoMarkerSet;
+class SoPickedPoint;
 
 class SoImage;
 class QImage;