[gfortran,patch] Correctly NULL-terminate character constant strings

[Paul Thomas]

Tobi,
>
> Fortran strings can contain '\0', so assuming that '\0' is the string 
> termination character may lead to problems.  Does code, which is not 
> there for debugging only, depend on NUL-termination of strings? 

I will in the next 24 hours check if this fixes the remaining 
iso_varying_string testcases, which die a death on zero length strings.  
I suspect that it will help ;-)

Paul