Bin a few unused forward declarations

Change-Id: I33d021d811ade38befa4c61de740ce86dfe08376

include/vcl/canvastools.hxx

@@ -43,22 +43,16 @@ namespace basegfx
     class B2DVector;
     class B2DPoint;
     class B2DRange;
-    class B2IVector;
     class B2IPoint;
     class B2IRange;
-    class B2DPolygon;
-    class B2DPolyPolygon;
 }
 
 namespace com { namespace sun { namespace star { namespace geometry
 {
-    struct RealPoint2D;
     struct RealSize2D;
-    struct RealRectangle2D;
     struct IntegerPoint2D;
     struct IntegerSize2D;
     struct IntegerRectangle2D;
-    struct RealBezierSegment2D;
 } } } }
 
 namespace com { namespace sun { namespace star { namespace rendering
@@ -67,7 +61,6 @@ namespace com { namespace sun { namespace star { namespace rendering
     class  XBitmap;
     class  XIntegerBitmap;
     class  XIntegerReadOnlyBitmap;
-    class  XPolyPolygon2D;
 } } } }
 
 namespace vcl