[gfortran] Optional comma after string literal in format

[Paul Brook]

> 2004-05-20  Roger Sayle  <roger@eyesopen.com>
>
> 	* io.c (format_item): If we're not being pedantic, allow the
> 	comma after a string literal to be optional in a format.
>
> 	* io/format.c (parse_format_list): Allow the comma after a string
> 	literal to be optional.
>
> 	* compile/format-1.f: New testcase.

Ok if changed to use gfc_notify_std.

Paul