make pg_controldata accept "-D dirname" - Mailing list pgsql-hackers

Hi.

I can never remember that pg_controldata takes only a dirname rather
than "-D dirname", and I gather I'm not the only one. Here's a tiny
patch to make it work either way. As far as I can see, it doesn't
break anything, not even if you have a data directory named "-D".

-- Abhijit