Silence warning in greasepencil-object branch

We don't have warnings in 2.8 because of include order.
But headers shouldn't depend on that for warnings, really.

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_dynamicpaint.h b/source/blender/blenkernel/BKE_dynamicpaint.h
index acb5e63d32f..12f61116f5f 100644
--- a/source/blender/blenkernel/BKE_dynamicpaint.h
+++ b/source/blender/blenkernel/BKE_dynamicpaint.h
@@ -28,6 +28,8 @@
  */
 
 struct Depsgraph;
+struct DynamicPaintCanvasSettings;
+struct DynamicPaintModifierData;
 struct Main;
 struct Scene;
 struct ViewLayer;