gnu: Remove guile-debbugs-next.

* gnu/packages/guile-xyz.scm (guile-debbugs-next): Remove variable.
* gnu/packages/mail.scm (mumi)[inputs]: Replace guile-debbugs-next with
guile-debbugs.

gnu/packages/guile-xyz.scm

@@ -1020,31 +1020,6 @@ (define-public guile-email
 format.")
     (license license:agpl3+)))
 
-(define-public guile-debbugs-next
-  (let ((commit "fb0ae064037a38a0d526e08b4ad24c52e205edb9")
-        (revision "2"))
-    (package (inherit guile-debbugs)
-      (name "guile-debbugs")
-      (version (git-version "0.0.3" revision commit))
-      (source (origin
-                (method git-fetch)
-                (uri (git-reference
-                      (url "https://git.savannah.gnu.org/git/guile-debbugs.git")
-                      (commit commit)))
-                (file-name (git-file-name name version))
-                (sha256
-                 (base32
-                  "195sacx2xc1mzzfljj62nfpi8mxn0rc6dabxckizjksnhb5irfwy"))))
-      (build-system gnu-build-system)
-      (native-inputs
-       `(("pkg-config" ,pkg-config)
-         ("autoconf" ,autoconf)
-         ("automake" ,automake)
-         ("texinfo" ,texinfo)))
-      (inputs
-       `(("guile" ,guile-2.2)
-         ("guile-email" ,guile-email))))))
-
 (define-public guile-newt
   (package
     (name "guile-newt")

gnu/packages/mail.scm

@@ -3034,7 +3034,7 @@ (define-public mumi
                      (,go ,(getenv "GUILE_LOAD_COMPILED_PATH"))))
                  #t))))))
       (inputs
-       `(("guile-debbugs" ,guile-debbugs-next)
+       `(("guile-debbugs" ,guile-debbugs)
          ("guile-email" ,guile-email)
          ("guile-fibers" ,guile-fibers)
          ("guile-json" ,guile-json-1)