Fix T65775: UV projection is dependant of the object position

The rotation matrix included the global object offset too. Now we only
take into account the actual offset that what sent to the function.

Reviewed By: Brecht

Differential Revision: http://developer.blender.org/D5094

source/blender/editors/uvedit/uvedit_unwrap_ops.c

@@ -1272,10 +1272,11 @@ static void uv_map_rotation_matrix_ex(float result[4][4],
   }
 
   /* but shifting */
-  copy_v4_fl(viewmatrix[3], 0.0f);
+  zero_v3(viewmatrix[3]);
 
   /* get rotation of the current object matrix */
   copy_m4_m4(rotobj, ob->obmat);
+  zero_v3(rotobj[3]);
 
   /* but shifting */
   add_v4_v4(rotobj[3], offset);