wine / dlls / itss / itss.c -> ICOM_THIS() macro is defined where ?

[Belxjander Serechai]

I have currently for the last several days been attempting to update
  my local installation of wine and found that I get blocked by this...

Apparently where this macro is used causes errors,

  is this a possible regression or something was missed at somepoint?

Thanks in advance,
  Jeremy