Creating ExternalObject with constant arguments can generate bad code

[Per Östlund]

Creating e.g. an ExternalCombiTimeTable using constant arguments like this:

model M
  Modelica.Blocks.Types.ExternalCombiTimeTable tableID =
    Modelica.Blocks.Types.ExternalCombiTimeTable(
      "test", "test", {{1, 2}, {3, 4}}, 0.0, {1},
      Modelica.Blocks.Types.Smoothness.LinearSegments,
      Modelica.Blocks.Types.Extrapolation.LastTwoPoints);
end M;

will cause the simulation to segfault due to a call in the generated code for the constructor:

  pack_integer_array(&_columns);

The issue seems to be that pack_integer_array modifies the array instead of creating a new array, but the given array in this case is a #DEFINE'd literal that can't be modified.

[Per Östlund]

Fixed in 3f21797.