Missing includes

Change-Id: I4cefabc51c00b0e6ffd0613c4409cc31e1aa5673
(cherry picked from commit d7ceaae4cd1b31edb92c4a0987048b3405b3d346)
diff --git a/drawinglayer/source/processor2d/vclhelperbufferdevice.cxx b/drawinglayer/source/processor2d/vclhelperbufferdevice.cxx
index fde5ba9..c9ef7ab 100644
--- a/drawinglayer/source/processor2d/vclhelperbufferdevice.cxx
+++ b/drawinglayer/source/processor2d/vclhelperbufferdevice.cxx
@@ -17,6 +17,12 @@
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <sal/config.h>

#include <algorithm>
#include <map>
#include <vector>

#include <vclhelperbufferdevice.hxx>
#include <basegfx/range/b2drange.hxx>
#include <vcl/bitmapex.hxx>