[patch, fortran] Fix PR 87673, rejects-valid

[Steve Kargl]

On Sun, Mar 10, 2019 at 09:04:18PM +0100, Thomas Koenig wrote:

> ! { dg-do compile }
> ! PR 87673 - used to cause errors about non-pure functions.
> !  A fragment from Richard Townsend's iso_varying_string, as modified by
> ! Ian Harvey to include F2003 language capabilities. For copyright notices
> ! see source at http://www.megms.com.au/download/aniso_varying_string.f90

Copyright notice?

If it isn't some version of gpl or lgpl, then you might need
to either get approval from FSF, get Richard Townshend to 
put the code that demonstrate the code under a gpl compatible
copyright, or rewrite the example that demonstrates the bug.

BTW, I think Ian's bug report is actually a duplicate of
another PR, but don't recall which one.

-- 
Steve