[gfortran] Allow digits before X format to be optional

[Paul Brook]

> 2004-05-20  Roger Sayle  <roger@eyesopen.com>
>
> 	* io.c (format_item): Allow the number before the X format to
> 	be optional when not -pedantic.

Ok.
Please copy gfortran patches to fortran@gcc.gnu.org.

Paul