gnu: autogen: Update to 5.18.16.

* gnu/packages/autogen.scm (autogen): Update to 5.18.16.
[inputs]: Update to guile-2.2.
[arguments]: Add ‘--disable-dependency-tracking’ to #:configure-flags.
Re-indent.

gnu/packages/autogen.scm

@@ -1,7 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013, 2014 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2015, 2016 Efraim Flashner <efraim@flashner.co.il>
-;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
+;;; Copyright © 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -32,22 +32,26 @@
 (define-public autogen
   (package
     (name "autogen")
-    (version "5.18.14")
+    (version "5.18.16")
     (source
      (origin
        (method url-fetch)
        (uri (string-append "mirror://gnu/autogen/rel" version
                            "/autogen-" version ".tar.xz"))
        (sha256
-       (base32
-        "1r06gam7sicb9ssn02mhv6r0g5vr4k0l0c67shpqa5i172cspizz"))))
+        (base32 "16mlbdys8q4ckxlvxyhwkdnh1ay9f6g0cyp1kylkpalgnik398gq"))))
     (build-system gnu-build-system)
     (native-inputs `(("pkg-config" ,pkg-config)
                      ("which" ,which)))
-    (inputs `(("guile" ,guile-2.0)
+    (inputs `(("guile" ,guile-2.2)
               ("perl" ,perl)))          ; for doc generator mdoc
     (arguments
-     '(#:phases
+     '(#:configure-flags
+       ;; XXX Needed to build 5.18.16.  ./configure fails without it:
+       ;; “Something went wrong bootstrapping makefile fragments for
+       ;;  automatic dependency tracking.  Try re-running configure with […]”
+       (list "--disable-dependency-tracking")
+       #:phases
        (modify-phases %standard-phases
          (add-before 'patch-source-shebangs 'patch-test-scripts
            (lambda _