message: add missing forward declarations
diff: @@ -10,6 +10,7 @@ class AliExternalTrackParam;
  class AliESDfriendTrack;
  class AliTrackPointArray;
  class TCut;
  +class AliESDEvent;
  class AliTPCcalibAlignInterpolation : public AliTPCcalibBase {
  public :
  