Hello,

This patch adds a support for bugs.gnu.org URLs to debbugs-browse-url.

I'm using this with the following workflow:
--8<---------------cut here---------------start------------->8---
(add-to-list 'load-path "/srv/src/elpa/packages/debbugs/")

(require 'debbugs)
(require 'debbugs-gnu)
(require 'debbugs-browse)

(setq browse-url-browser-function
      `((,debbugs-browse-url-regexp . debbugs-browse-url)
        ("." . browse-url-conkeror)))

;; Example: call those or M-x ffap on URLs
(debbugs-browse-url "https://bugs.gnu.org/29552")
(debbugs-browse-url "https://debbugs.gnu.org/29552")
(debbugs-browse-url "https://debbugs.gnu.org/cgi/bugreport.cgi?bug=29552")
--8<---------------cut here---------------end--------------->8---