WeakRef updated to support Tango, too

[jcc7]

== Quote from Moritz Warning (moritzwarning at _nospam_web.de)'s article
> On Wed, 13 Feb 2008 16:23:42 +0900, Bill Baxter wrote:
> > I updated the WeakRef class I posted a while ago to work under
> > Tango too.
> >
> > Can I maybe put this in Scrapple, Oh Master of the Scraps?
> > (dsource login is 'baxissimo')
> >
> > --bb
> I'm no maintainer of Scrapple, but making a ticket is certainly a
> good idea.
> http://dsource.org/projects/tango.scrapple

Since his code works with both Phobos and Tango (via some versioning), he probably
meant Scrapple (Original Flavor):
http://dsource.org/projects/scrapple/

(Though I wouldn't be surprised if tango.scrapple would accept it, too.)