gnu: qt: Use modify-phases syntax.

* gnu/packages/qt.scm (qt): Use modify-phases syntax.

gnu/packages/qt.scm

@@ -151,8 +151,8 @@
        ;; A more structural fix is needed.
        #:parallel-build? #f
        #:phases
-         (alist-replace
-          'configure
+       (modify-phases %standard-phases
+         (replace 'configure
            (lambda* (#:key outputs #:allow-other-keys)
              (let ((out (assoc-ref outputs "out")))
                (substitute* '("configure" "qtbase/configure")
@@ -189,8 +189,7 @@
                        "-no-avx"
                        "-no-avx2"
                        "-no-mips_dsp"
-                      "-no-mips_dspr2"))))
-          %standard-phases)))
+                       "-no-mips_dspr2"))))))))
     (home-page "http://qt-project.org/")
     (synopsis "Cross-platform GUI library")
     (description "Qt is a cross-platform application and UI framework for