gnu: guile-next: Update to 2.9.1.

* gnu/packages/guile.scm (guile-next): Update to 2.9.1.
[native-inputs, arguments]: Remove.
[properties]: New field.

gnu/packages/guile.scm

@@ -323,39 +323,14 @@ (define-public guile-next
     (package
       (inherit guile-2.2)
       (name "guile-next")
-      (version (git-version "2.99" revision commit))
+      (version "2.9.1")
       (source (origin
-                (method git-fetch)
-                (uri (git-reference
-                      (url "https://git.savannah.gnu.org/git/guile.git")
-                      (commit commit)))
+                (inherit (package-source guile-2.2))
+                (uri (string-append "https://alpha.gnu.org/gnu/guile/guile-"
+                                    version ".tar.xz"))
                 (sha256
                  (base32
-                  "1c2xy5cflg0hws48914rz3z8mdmf8w3lblfic0kxnymcmdv9cbhv"))
-                (file-name (git-file-name name version))))
-      (native-inputs
-       `(("autoconf", autoconf)
-         ("automake" ,automake)
-         ("libtool" ,libtool)
-         ("gettext" ,gnu-gettext)
-         ("texinfo" ,texinfo)
-         ("flex" ,flex)
-         ,@(package-native-inputs guile-2.2)))
-      (arguments
-       (substitute-keyword-arguments (package-arguments guile-2.2)
-         ((#:phases phases '%standard-phases)
-          ;; XXX: The default 'bootstrap' phase tries to execute the
-          ;; ./bootstrap directory.
-          `(modify-phases ,phases
-             (replace 'bootstrap
-               (lambda _
-                 (patch-shebang "build-aux/git-version-gen")
-                 (invoke "autoreconf" "-vfi")))
-             (add-before 'check 'skip-version-test
-               (lambda _
-                 ;; Remove this test that's bound to fail.
-                 (delete-file "test-suite/tests/version.test")
-                 #t))))))
+                  "0iba93yqn6mvgid0rfsrg4amym36pg9m8cqdplxsy222blrj9gh1"))))
       (native-search-paths
        (list (search-path-specification
               (variable "GUILE_LOAD_PATH")
@@ -363,7 +338,9 @@ (define-public guile-next
              (search-path-specification
               (variable "GUILE_LOAD_COMPILED_PATH")
               (files '("lib/guile/3.0/site-ccache"
-                       "share/guile/site/3.0"))))))))
+                       "share/guile/site/3.0")))))
+      (properties '((ftp-server . "alpha.gnu.org")
+                    (upstream-name . "guile"))))))
 
 (define (make-guile-readline guile)
   (package