solaris /dev/console patch

[Havoc Pennington]

Robert McQueen wrote:
> Similar to Havoc's suggestions for implementing system-specific policies
> for looking up the location of existing buses, a simple idea could be
> just to say that the at console policy is always implemented by a helper
> program. Then we could avoid too many conditional compilations within
> the code itself, and just have our configure script choose which one to
> compile and install based on which system we're on. How does this sound?
> 

There may be efficiency issues...

I'm not sure how complicated this needs to be... each "backend" is what, 
20-40 lines of code, isn't it?

Havoc