Code Cleanup: remove non existing function declarations.

added some missing functions too - which are not used yep but should be there for api completeness.
* CDDM_set_mloop
* CDDM_set_mpoly
* BLI_mempool_count

source/blender/python/intern/bpy_app_handlers.h

@@ -28,6 +28,5 @@
 #define __BPY_APP_HANDLERS_H__
 
 PyObject *BPY_app_handlers_struct(void);
-void BPY_app_handlers_clear(void);
 
 #endif // __BPY_APP_HANDLERS_H__