[patch, fortran] Fix PR 50690

[Thomas Koenig]

Hi Jakub,

> Both of these arrays should be really vec.h vectors, it doesn't
> make any sense to handcode the same thing everywhere.
> You can then start with NULL vectors and push something using VEC_safe_push
> only when needed and let it handle reallocation etc.

I tried that originally, but could not get it to work; getting the
macros right just didn't happen.

A cleanup patch would be OK, though.

	Thomas