Cleanup: unused struct declarations

source/blender/blenkernel/BKE_subsurf.h

@@ -42,7 +42,6 @@ struct CCGElem;
 struct CCGFace;
 struct CCGVert;
 struct DMFlagMat;
-struct DMGridAdjacency;
 struct DerivedMesh;
 struct EdgeHash;
 struct MPoly;

source/blender/depsgraph/intern/builder/deg_builder_relations.h

@@ -84,7 +84,6 @@ struct DepsRelation;
 struct Depsgraph;
 struct IDDepsNode;
 struct OperationDepsNode;
-struct RootDepsNode;
 struct RootPChanMap;
 struct TimeSourceDepsNode;
 

source/blenderplayer/bad_level_call_stubs/stubs.c

@@ -47,8 +47,6 @@ struct BMEditMesh;
 struct Base;
 struct BoundBox;
 struct Brush;
-struct CSG_FaceIteratorDescriptor;
-struct CSG_VertexIteratorDescriptor;
 struct ChannelDriver;
 struct ColorBand;
 struct Context;

source/gameengine/Ketsji/KX_Scene.h

@@ -55,8 +55,6 @@
 /**
  * \section Forward declarations
  */
-struct SM_MaterialProps;
-struct SM_ShapeProps;
 struct Scene;
 
 class CTR_HashedPtr;