Time for a new DLL release

[DJ Delorie]

> I would like to make a new release next week but I'm not 100% sure how
> to do this.  I can put a new version of cygwin-whatever.tar.gz on the
> web site but we don't really want to have everyone download the entire
> distribution just to update cygwin.

Accept the fact that setup doesn't support updates yet, and publish
instructions for a manual upgrade.  It's not that hard to do if cygwin
is already installed, except that the dll needs to be moved into place
manually, which means untargz'ing in a temp directory, and using
explorer to move the files into place.