bug#5788: Savannah "Bugs" link broken

[Bob Proulx]

On the Savannah coreutils project page:

  https://savannah.gnu.org/bugs/?func=additem&group=coreutils

The "Bugs" link points to:

  http://debbugs.gnu.org/coreutils/

But that location produces an HTTP 404 Not Found error.  The working
link location is:

  http://debbugs.gnu.org/coreutils

I don't know if enhancing debbugs.gnu.org to accept that URL is a
better solution than fixing the linking url.

Bob