[Nmh-workers] Setting minimum automake version.

[Lyndon Nerenberg]

> 
>> There's plenty about. The 2.61 requirement already necessitates
>> compiling autoconf on RHEL5 (which only has up to 2.59). It's
>> a pain in the arse, but I can live with it. Unless there's a
>> *significant* benefit in switching, I'd suggest sticking with
>> what we have now, rather than arbitrarily making a self-compiled
>> autoconf necessary on more systems than we already have now.
> 
> The theory is that this only bites people compiling from the git repo.  
> "Official" source releases will have all of the auto* goop pre-processed on 
> their behalf, so it shouldn't matter.
> 
> --lyndon
>