Broken http.us.debian.org site

[John Whitley <whitley@cse.Buffalo.EDU>]

It appears that the http.us.debian.org site ftp1.us.debian.org, aka IP
206.187.92.15, isn't correctly mirroring the unstable/main directories
for powerpc.  Specifically:
  http://http.us.debian.org/debian/distsunstable/main/binary-powerpc
is an empty directory.

I took the liberty of emailing the webmaster of that site regarding
the mirror failure.

This is the source of those annoying 404 Not Found errors that crop up 
when using the Debian package tools.

-- John