gnu: unclutter: Use 'modify-phases'.

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

gnu/packages/xdisorg.scm

@@ -514,10 +514,10 @@ include cursor in the resulting image.")
     (build-system gnu-build-system)
     (arguments
      '(#:tests? #f                      ; no check target
-       #:phases (alist-delete
-                 'configure
-                 (alist-replace
-                  'install
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure)
+         (replace 'install
            (lambda* (#:key inputs outputs #:allow-other-keys)
              (let* ((out  (assoc-ref outputs "out"))
                     (bin  (string-append out "/bin"))
@@ -527,8 +527,7 @@ include cursor in the resulting image.")
                (zero?
                  (system* "make" "install" "install.man"
                           (string-append "BINDIR=" bin)
-                                (string-append "MANDIR=" man1)))))
-                  %standard-phases))))
+                          (string-append "MANDIR=" man1)))))))))
     (inputs `(("libx11" ,libx11)))
     (home-page "http://ftp.x.org/contrib/utilities/")
     (synopsis "Hide idle mouse cursor")