misc warnings/fixes

- WITH_OPENJPEG wasn't defined for creator.c with CMake.
- remove shadowed/redefined vars.
- remove some unused RNA report args.
- re-arrange IMB_FILE_TYPES so IRIS is not the first format tested, since its not very common test JPEG and PNG first.

source/blender/editors/interface/interface_utils.c

@@ -99,7 +99,6 @@ uiBut *uiDefAutoButR(uiBlock *block, PointerRNA *ptr, PropertyRNA *prop, int ind
 			break;
 		case PROP_POINTER: {
 			PointerRNA pptr;
-			int icon;
 
 			pptr= RNA_property_pointer_get(ptr, prop);
 			if(!pptr.type)