Cleanup: Remove unused GSet forward declarations

source/blender/blenkernel/BKE_gpencil_legacy.h

@@ -16,7 +16,6 @@ struct BlendDataReader;
 struct Brush;
 struct CurveMapping;
 struct Depsgraph;
-struct GHash;
 struct ListBase;
 struct MDeformVert;
 struct Main;

source/blender/blenlib/BLI_session_uid.h

@@ -32,7 +32,7 @@ bool BLI_session_uid_is_equal(const SessionUID *lhs, const SessionUID *rhs);
 
 uint64_t BLI_session_uid_hash_uint64(const SessionUID *uid);
 
-/* Utility functions to make it possible to create GHash/GSet with UID as a key. */
+/* Utility functions to make it possible to create set/map with UID as a key. */
 
 uint BLI_session_uid_ghash_hash(const void *uid_v);
 bool BLI_session_uid_ghash_compare(const void *lhs_v, const void *rhs_v);

source/blender/sequencer/SEQ_animation.hh

@@ -13,7 +13,6 @@
 #include "ANIM_action.hh"
 #include "ANIM_action_legacy.hh"
 
-struct GSet;
 struct ListBase;
 struct Scene;
 struct Sequence;