[docs] Add link to gfortran wiki for binaries

[Gerald Pfeifer]

On Mon, 1 Aug 2005, Paul Brook wrote:
>> Do we really need a separate page to track gfortran binaries?  I'd hope
>> that we can get most (if not all) of those building GCC binary packages
>> to include gfortran.
> If and when that happens the wiki page will be obsolete, and we can 
> remove the link. The existence of these binaries is IMHO proof that
> they are useful to someone.

Fair enough.  I'm just hoping gfortran will become very widely used and
commonly built rather sooner than later (at which point we can revert the 
patch). :-)

Gerald