[patch,fortran] PR90374 add e0 zero width exponent support

[Jerry DeLisle]

Hi all,

The attached patch implements the last piece of this which enables the zero 
width exponent, giving  a processor dependent width.

Regression tested on x86_64-pc-linux-gnu.

I don't think it is very intrusive and I updated the test case.

OK for trunk?

Regards,

Jerry

2019-11-27  Jerry DeLisle  <jvdelisle@gcc.ngu.org>

	PR fortran/90374
	* io.c (check_format): Allow zero width expoenent with e0.

	io/format.c (parse_format_list): Relax format checking to allow
	e0 exponent specifier.

	* gfortran.dg/fmt_zero_width.f90: Update test.



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