Blender Git Loki

Fix build error due to forward enum declaration

In full build, the following error happens. So fix it by including the
definition file before the forward declaration one.

```
In file included from source/blender/io/collada/SkinInfo.cpp:40:
source/blender/blenkernel/BKE_object_deform.h:62:6: error:
enumeration previously declared with nonfixed underlying type
enum eVGroupSelect
^
In file included from source/blender/io/collada/SkinInfo.cpp:36:
source/blender/makesdna/DNA_scene_types.h:2099:14: note:
previous declaration is here
typedef enum eVGroupSelect {
^
1 error generated.
```