[patch, fortran] Fix the fix to the error messages.

[Brooks Moses]

Brooks Moses wrote:
> As per Janne's comment, my fix to the GFortran error messages was 
> insufficent to actually produce proper Emacs compatiblity.  Thus, the 
> following patch, which corrects the problems he mentioned.
> 
> Regtested by JerryD (thanks!).  Ok for trunk?

Approved by Steve Kargl on IRC, committed to trunk.

This should make the GFortran error messages properly Emacs-compliant; 
if that turns out not to be the case in practice, please let me know.

- Brooks