gnu: guile-ncurses: Use 'modify-phases'.

* gnu/packages/guile.scm (guile-ncurses)[arguments]: Use 'modify-phases'.

gnu/packages/guile.scm

@@ -379,8 +379,9 @@ many readers as needed).")
                                (string-append "--with-guilesitedir="
                                               (assoc-ref %outputs "out")
                                               "/share/guile/site/2.0"))
-       #:phases (alist-cons-after
-                 'install 'post-install
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'install 'post-install
            (lambda* (#:key outputs #:allow-other-keys)
              (let* ((out   (assoc-ref outputs "out"))
                     (dir   (string-append out "/share/guile/site/"))
@@ -388,8 +389,7 @@ many readers as needed).")
                (substitute* files
                  (("\"libguile-ncurses\"")
                   (format #f "\"~a/lib/libguile-ncurses\""
-                                out)))))
-                 %standard-phases)))
+                          out)))))))))
     (home-page "http://www.gnu.org/software/guile-ncurses/")
     (synopsis "Guile bindings to ncurses")
     (description