Cleanup: use explicit enum type for duplicate option of BKE_object_duplicate

Using enum type itself in implementations, and uint in headers (as using
enums types in headers is a pain when enum are not defined and used in a
single same header file...).

source/blender/io/collada/BCMath.cpp

@@ -17,6 +17,8 @@
  * All rights reserved.
  */
 
+#include "BLI_utildefines.h"
+
 #include "BCMath.h"
 #include "BlenderContext.h"