Add missing macro definitions

[beutlich]

Closes #4280.

[beutlich]

Should we add the undefines to the other header files as well?

[maltelenz]

With this, I was able to build it cleanly (on Linux) with our vendor-provided ModelicaUtilities.h.

Should all of the define stuff be removed from .CI/Test/ModelicaUtilities.h, to more closely resemble a vendor-provided ModelicaUtilities.h, and avoid accidental reliance on these defines?

This comment in the ModelicaUtilities.h is not correct:

   A generic C-implementation of these functions cannot be given,
   because it is tool dependent how strings are output in a
   window of the respective simulation tool. Therefore, only
this header file is shipped with the Modelica Standard Library.

since it is not shipped. To be fair, this PR didn't touch that part.

[beutlich]

This comment in the ModelicaUtilities.h is not correct:

It's updated now.

Should all of the define stuff be removed from .CI/Test/ModelicaUtilities.h,

I prefer to have it as is. After all, it is test code only.

Should we add the undefines to the other header files as well?

From what I checked, it is fine as it is.