[Voiceglue] Quick & simple improvement

[Doug Campbell]

> doc/install-voiceglue.sh:239
> Change
> join (", ", @prereqs_missing))
> to
> join (" ", @prereqs_missing))
>  
> apt-get (possibly rpm too..?) accepts the resulting string of 
> dependencies without further modification. Just something I end 
> up changing on each installation...

A valid point.  In emacs, it's a 4-keystroke process for me to remove
the commas, but of course not everyone works in emacs.

I've also toyed with the idea of providing the option to run the
install of any missing packages vi yum/apt, but I get scared off
by thinking that there may be other ways that people do package management.

Doug Campbell