Patch: enable dependency tracking in libgfortran

[FX Coudert]

:REVIEWMAIL:

> It seems as though libgfortran disables automake's automatic
> dependency tracking feature.  The comment says "just for now", and
> after a bit of research I think that this was probably cut-and-pasted
> from libstdc++.

Cool! Now we get to have real dependecy tracking like grown up  
libraries :)

> I think this obsoletes an earlier patch which adds explicit
> dependencies:
>
>     http://gcc.gnu.org/ml/gcc-patches/2007-01/msg00594.html
>
> Ok?

OK. Although it doesn't completely obsolete my patch (above), because  
it's shuffling a few functions to the files they really belong to, so  
if you don't mind, I'd like to commit it first (without the explicit  
dependencies) and then commit yours. Is that OK with you? (I was on  
my way commiting my patch anyway, so it should be done real soon).

Thanks for your help,
FX