[gfortran] patch for pr libfortran/21303

[FX Coudert]

> Attached proposed patch fixes PR libfortran/21303, which is about 
> allowing (as an extension) a L format descriptor to have no width 
> specified (in which case, the width is taken to be 1). It adds a few 
> standard checking routines that do not issue an error/warning, as the 
> front-end format checking error handling doesn't mix well with 
> gfc_notify_std. It adds the same thing into the library for runtime 
> warnings/errors.
>
> Regtested on i686-linux. OK for trunk?

Here is an up-to-date patch (thanks Jerry for telling me it was non 
longer in sync and requesting a testcase!) as well as a full testcase.

FX

PS: the dg-output directives of the testcase might not be written 
correctly, I need to wait until my bootstrap finishes to test this, and 
it'll take a some time. but you get the spirit of it... :)

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