Allow attaching a model to itself.

PiperOrigin-RevId: 623806812
Change-Id: I9b0e36308be754e838790ead8ec717953e4b2350

src/user/user_objects.h

@@ -584,6 +584,7 @@ class mjCCamera : public mjCCamera_, private mjsCamera {
   void Compile(void);                     // compiler
   void CopyFromSpec(void);
   void PointToLocal(void);
+  void NameSpace(const mjCModel* m);
 };
 
 
@@ -622,6 +623,7 @@ class mjCLight : public mjCLight_, private mjsLight {
   void Compile(void);                     // compiler
   void CopyFromSpec(void);
   void PointToLocal(void);
+  void NameSpace(const mjCModel* m);
 };