[gfortran,patch] Handle "%3$d"-style format specifiers in error.c

[Brooks Moses]

FX Coudert wrote:
> Here's what I commited to mainline, taking into account Andreas' and  
> Brooks' remarks.
> 
> Thanks Brooks for reviewing this,

Hmm -- perhaps I should have been clearer that my "this otherwise looks 
ok to me" couldn't count as a formal review, because I'm not a 
maintainer?  If so, my apologies.

On the other hand, my understanding of the write access policies is that 
since FX is a maintainer he doesn't need a formal review in order to 
commit things, and so my informal review is more than sufficient.  (And, 
with that said -- I did give it the same level of scrutiny I would have 
had I been giving it a formal review.)

- Brooks