[CFT/RFC]: refactor bsd.prog.mk to understand multiple programs instead of a singular program

[Simon J. Gerraty]

On Fri, 26 Oct 2012 22:02:00 +0100, Chris Rees writes:
>In that case we have a switch time on the order of years, not weeks; 8.3 is
>supported until May '14, and unless we get a :tl etc MFC into 8, even
>longer.  All this time the ports tree must work with pmake.

I'm pretty sure I was told it is already in 8 and 7

>I don't want to discourage you or belittle your excellent work here, but
>Marcel made me very nervous with his comment on the process being "a few
>weeks".

That was based on discussions at the last devsummit.