[PATCH] PR 78534 Change character length from int to size_t

[FX]

> I was finally able to get a 32-bit i686 compiler going (my attempts to
> do this on a x86_64-pc-linux-gnu host failed, in the end I resorted to
> running 32-bit builds/tests on a i686 container). At least on i686,
> the patch below on top of the big charlen->size_t patch fixes the
> failures

Patch approved. The old code used gfc_extract_int, which bails out if a non-constant expression is passed, so this is the right thing to do.

FX