[9fans] inferno from hg does not build out of the box

[Sam Watkins <sam@nipl.net>]

On Thu, Oct 01, 2009 at 11:23:24PM +1000, Sam Watkins wrote:
> Speaking of hg - I think we should patch it to support empty directories so
> that the inferno checkout actually builds.

It's a bit sad when a modern OS (inferno) from one of the best labs in the
world does not build (from hg), due to a error that could be avoided with a
tiny patch.  You are losing new users because of this (or aggrevating them).
Why not commit the list of empty directories and add mkdir -p `<empty-dirs`
to makemk.sh or something like that?  It's a 1 minute fix, and could be removed
if anyone fixes hg.  Also there is a standard utility "uname" which could be
used to write a short configure script (for unix; "" would mean plan 9!).
I'm happy to do this if someone is willing to review and commit it.

Sam