[fortran] patch for PR 12839 - incorrect IO of inf

[Tobias Schlüter]

Bud Davis wrote:
> Below is a patch for your consideration that implements the output of
> +inf/-inf/nan as per the draft Fortran 2003 standard.  At least it is my
> attempt to implement it properly :)
> 
Did your request on comp.lang.fortran yield a result? It seems this 
patch (or a corrected followup) has never gone in. the PR is still open 
also.

- Tobi