Fix compilation with all skinned mesh loaders disabled.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3583 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CSceneManager.cpp

@@ -18,6 +18,12 @@
 
 #include "os.h"
 
+// We need this include for the case of skinned mesh support without
+// any such loader
+#ifdef _IRR_COMPILE_WITH_SKINNED_MESH_SUPPORT_
+#include "CSkinnedMesh.h"
+#endif
+
 #ifdef _IRR_COMPILE_WITH_IRR_MESH_LOADER_
 #include "CIrrMeshFileLoader.h"
 #endif