[gofrtran] Fix PR 16465: accept -ffixed-line-length-72

[Paul Brook]

On Sunday 11 July 2004 13:29, Tobias Schlüter wrote:
> Trivial fix for that bug.
>
> Built and verified that it works as expected. I didn't commit this as
> obvious, because someone might prefer if we allowed arbitrary line
> lengths, as in -ffixed-line-length-N, where N is an arbitrary positive
> integer. I can't see much value in that, but there might be.

The documentation (fortran/invoke.texi) implies that any value is allowed, so 
either the code or the documentation needs fixing.

g77 supports arbitary lengths, so we probably should too.

You might want to fix -ffixed-line-length-none at the same time:)

Paul