Avoid pointless const_cast, use getConstArray in all cases.

Another code-review follow-up fix from fdo#44533 - don't use
Sequence::getArray, that tends to create a new copy everytime you
call.

canvas/source/directx/dx_impltools.cxx

@@ -452,8 +452,8 @@ namespace dxcanvas
                     // TODO(F1): Closed/open polygons
 
                     // convert from RealPoint2D array to Gdiplus::PointF array
-                    ::std::transform( const_cast< uno::Sequence< geometry::RealPoint2D >& >(points[nCurrPoly]).getArray(),
-                                      const_cast< uno::Sequence< geometry::RealPoint2D >& >(points[nCurrPoly]).getArray()+nCurrSize,
+                    ::std::transform( points[nCurrPoly].getConstArray(),
+                                      points[nCurrPoly].getConstArray()+nCurrSize,
                                       aPoints.begin(),
                                       implGdiPlusPointFromRealPoint2D );
 

canvas/source/vcl/textlayout.cxx

@@ -465,8 +465,8 @@ namespace vclcanvas
                                                      renderState);
 
         // fill integer offsets
-        ::std::transform( const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray(),
-                          const_cast< uno::Sequence< double >& >(inputOffsets).getConstArray()+inputOffsets.getLength(),
+        ::std::transform( inputOffsets.getConstArray(),
+                          inputOffsets.getConstArray()+inputOffsets.getLength(),
                           outputOffsets,
                           OffsetTransformer( aMatrix ) );
     }